Materiały źródłowe

• #1 Keratitis

  https://johnsonmemorial.org/jmh-health/disease-conditions/con-20374093

  Keratitis may or may not be associated with an infection. Noninfectious keratitis can be caused by a relatively minor injury, such as from wearing your contact lenses too long or getting a foreign body in the eye. Infectious keratitis can be caused by bacteria, viruses, fungi and parasites. […] Causes of keratitis include: […] Injury. If any object scratches or injures the surface of your cornea, noninfectious keratitis may result. In addition, an injury may allow microorganisms to gain access to the damaged cornea, causing infectious keratitis. […] Bacteria, fungi or parasites. These organisms may live on the surface of a contact lens or contact lens carrying case. The cornea may become contaminated when the lens is in your eye, resulting in infectious keratitis. Poor contact lens hygiene or contact lens overwear can cause both noninfectious and infectious keratitis.

• #1 What is keratitis? | New York Eye & Ear

  https://www.nyee.edu/care/eye/cornea/diseases/infection-inflammation

  Keratitis is a medical term for inflammation of the cornea. Symptoms include rapid onset of pain and redness of the eye, itching, blurred vision, tearing or discharge from the eye, and sensitivity to light. […] Keratitis resulting from an infection is among the leading causes of preventable blindness worldwide. The disease occurs far more frequently in developing countries, with the total number of cases globally estimated at 500,000 a year. The number of cases in the United States range between 25,000 and 30,000 annually. […] The most common cause of keratitis is injury or infection, but keratitis may also be noninfectious and develop from a wide range of other conditions. […] Corneal infections are caused by a wide variety of microorganisms, including bacteria, viruses, fungi, and protozoa. Bacteria are the most frequent cause of infectious keratitis. The most common groups of bacteria responsible for bacterial keratitis are streptococcus, pseudomonas, enterobacteriaceae (including klebsiella, enterobacter, serratia, and proteus), and staphylococcusspecies.

• #1

  https://journals.lww.com/jcor/fulltext/2019/07010/incidence_of_various_causes_of_infectious.10.aspx

  Infectious keratitis is potential causes for vision loss in India. […] The aim of this study was to evaluate the incidence of various causes of infectious keratitis in this part of rural central India, predisposing factor and visual morbidity. […] Prevalence of Fungal keratitis (59.09%) was higher than bacterial (19.31%) and viral (17.04%) in this part of India. […] Agricultural injuries are the main predisposing factor for infectious keratitis in this region. […] Infective keratitis caused by bacteria, fungi, viruses, and parasite results into potentially sight-threatening ocular infection. […] Our study highlights that the incidence of fungal corneal ulcer is higher among various causes of infectious keratitis in the part of rural central India.

• #1 Bacterial Keratitis – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK574509/

  The systemic conditions predisposing to bacterial keratitis are diabetes mellitus, malnourishment, connective tissue or autoimmune pathologies, Steven-Johnson syndrome (SJS), ocular mucous membrane pemphigoid (OMMP), atopic dermatitis, xerophthalmia, blepharoconjunctivitis, 5th and 7th cranial nerve palsy, graft versus host disease, immunosuppression (AIDS) and chronic alcoholism. […] The bacterial species causing keratitis are the following: Gram-positive cocci include Staphylococcus aureus, Staphylococcus epidermidis, and Streptococcus pneumoniae; Gram-positive bacilli include Corynebacterium diphtheriae and Corynebacterium xerosis; Gram-negative bacilli include Pseudomonas aeruginosa, Acinetobacter species; Enterobacteriaceae species include Escherichia coli, Klebsiella, Serratia, and Proteus mirabilis; Gram-negative diplococci, namely Neisseria gonorrhoeae and Neisseria meningitidis; Gram-negative diplobacillus include Moraxella lacunata; Non-tuberculous mycobacterium includes Mycobacterium fortuitum and Mycobacterium chelonae; Gram-negative coccobacillus include Haemophilus influenza and Haemophilus aegyptius; Gram-positive filamentous bacteria include Nocardia asteroids and Nocardia brasiliensis; Coagulase-negative Staphylococcus is one of the most common bacterial species identified recently.

• #1 Bacterial Keratitis – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK574509/

  The most common species causing bacterial keratitis include Staphylococcus aureus, Staphylococcus epidermidis, Streptococcus pneumoniae, Pseudomonas aeuruginosa, and species of the Enterobacteriaceae family. […] The bacterial species that can penetrate the intact corneal epithelium are Neisseria gonorrhoeae, Corynebacterium diphtheriae, Hemophilus aegyptius, and Listeria monocytogenes.

• #1 Keratitis: Symptoms, Causes, and Treatment | MyVision.org

  https://myvision.org/eye-conditions/keratitis/

  Risk factors that make corneal ulcers more likely to develop include: […] Viral keratitis is the most common type of the disease, although there’s a significant number of people who get the condition from injury to the eye. […] Conjunctivitis is the inflammation of the white part of the eye and the lines inside the eyelids. Keratitis is the inflammation of the clear covering of the eye. The former can be caused by many things, including viruses, while the latter can develop because of injury, parasites, fungi, bacteria, or viruses.

• #1 What Causes HSV (Herpes Simplex Virus) Keratitis | Healthy Contact Lens Wear and Care | CDC

  https://www.cdc.gov/contact-lenses/causes/what-causes-hsv-herpes-simplex-virus-keratitis.html

  HSV (Herpes Simplex Virus) keratitis is an infection of the cornea (the clear dome that covers the colored part of the eye) that is caused by HSV. The infection usually heals without damaging the eye, but more severe infections can lead to scarring of the cornea or blindness. HSV keratitis is a major cause of blindness worldwide. […] HSV-1, the strain causing mouth cold sores, is the primary corneal infection cause. […] Most HSV keratitis infections happen after another part of the bodymost commonly the mouthhas already been infected by HSV. HSV keratitis is often the result of a „flare up” (reactivation) of the earlier infection. […] HSV keratitis can lead to vision loss or blindness if left untreated. […] Each case of HSV keratitis is unique, and an eye doctor should determine the best treatment for each patient. […] People who have had HSV keratitis are at risk for recurrences of the same infection.

• #1 Keratitis – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK559014/

  Viral keratitis – This includes infection by Herpes simplex virus (HSV), Herpes zoster virus (HZV), Adenovirus, and others. […] Non-infectious Keratitis […] Local causes – include trichiasis, giant papillae, foreign body in sulcus subtarsalis […] Peripheral ulcerative keratitis […] Collagen vascular diseases, like rheumatoid arthritis, granulomatosis with polyangiitis, polyarteritis nodosa, relapsing polychondritis, systemic lupus erythematosus, and others […] Neurotrophic corneal ulcer (post-herpes zoster ophthalmicus, trigeminal nerve damage due to surgery or tumor) […] Xerophthalmia.

• #1 Keratitis Causes, Treatment, Diagnosis, Types & NHS Symptoms

  https://www.medicinenet.com/keratitis/article.htm

  Keratitis, the eye condition in which the cornea becomes inflamed, has many potential causes. Various types of infections, dry eyes, abnormalities of the eyelids, injury, and a large variety of underlying medical diseases may all lead to keratitis. Some cases of keratitis result from unknown factors. […] Infection is the most frequent cause of keratitis. Bacteria, viruses, fungi, and parasitic organisms may all infect the cornea, causing infectious or microbial keratitis. […] Bacteria most frequently responsible for keratitis include Staphylococci, Hemophilus, Streptococci, and Pseudomonas. […] Viruses that infect the cornea include respiratory viruses, including the adenoviruses and others responsible for the common cold. The herpes simplex virus is another common cause of keratitis.

• #1 Infectious keratitis: an update on epidemiology, causative microorganisms, risk factors, and antimicrobial resistance | Eye

  https://www.nature.com/articles/s41433-020-01339-3

  IK can be caused by a wide variety of pathogens including bacteria, fungi, protozoa and viruses. […] Polymicrobial infection has shown to be accountable for ~215% of all IK cases. […] The pathogenesis of CL-related IK is complex and multifactorial. […] In terms of underlying aetiologies, CL-related keratitis is most commonly associated with P. aeruginosa and Acanthamoeba spp., which are both free-living microorganisms that are ubiquitously present in the environment, including water and CL solutions. […] Trauma serves as another common risk factor for IK in both developed and developing countries. […] Fungal keratitis is by far the most common cause (4783%) of trauma-related IK, especially in regions such as Asia and Africa which are dominated by agricultural communities. […] Ocular surface diseases (OSDs), encompassing DEDs, blepharitis, neurotrophic keratopathy, Steven-Johnson syndrome, ocular cicatricial pemphigoid and bullous keratopathy, have been identified as one of the main risk factors for IK in both developed and developing countries.

• #1 Fungal keratitis – Wikipedia

  https://en.wikipedia.org/wiki/Fungal_keratitis

  Fungal keratitis has been reported to be caused by more than 70 different fungi, of which Fusarium, Aspergillus and Candida are responsible for 95% of cases. […] A. flavus and A. fumigatus are the most common types of Aspergillus to cause fungal keratitis. F. Solani is the most common type of Fusarium and others include Curvularia and Acremonium. C. albicans, C. guilliermondii and C. parapsilosis are the main types of Candida to cause fungal keratitis. […] Other fungus causes; such as Phaeoisaria clematidis was found in 2000. Then Pleurothecium recurvatum (formerly Carpoligna pleurothecii) was found in 2010.

• #1 Keratitis – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK559014/

  Keratitis is a clinical entity wherein inflammatory cells infiltrate different corneal layers in response to noxious stimuli, either infectious exogenous agents or self-antigens. […] This article discusses the etiology and available current and future management options for different types of keratitis. […] Based on the etiological agent, keratitis can be classified as: […] Infectious Keratitis […] Bacterial keratitis – including Pseudomonas, Staphylococcus, Streptococcus, Moraxella, Nocardia, and Atypical Mycobacteria […] Protozoal keratitis – including Acanthamoeba […] Keratitis by Oomycete – Pythium keratitis. Morphologically, very similar to fungi; however, unlike fungi, the cell wall here contains (1-3)(1-6) beta D glucan […] Fungal keratitis – This includes infection by Aspergillus, Fusarium, Candida (yeast), Cladosporium, Alternaria, Curvularia, and Microsporidia

• #1 Infectious Keratitis: Causes, Treatment, and Prevention Guide

  https://ophthalmologybreakingnews.com/infectious-keratitis-causes-treatment-prevention-guide

  Infectious keratitis is an inflammation of the cornea, the transparent front part of the eye, often caused by bacterial, viral, fungal, or parasitic infections. […] Various microorganisms can be responsible for infectious keratitis. Bacteria, viruses, fungi, and parasites can invade the cornea, leading to inflammation. Common sources include contaminated contact lenses, eye injuries, or pre-existing eye conditions. […] Bacterial keratitis, often associated with poor contact lens hygiene, can progress rapidly. Fungal keratitis is more prevalent in agricultural regions and can result from trauma involving plant material. Viral keratitis, caused by herpes simplex virus, can lead to recurring infections. […] The specific pathogens of infectious keratitis have geographic differences based on climate-related flora and type of trauma, including contact lens wear. […] In contrast, the Asia Corneal Society Infectious Keratitis Study reports a predominance of fungal keratitis, Fusarium, in India and China. The worldwide prevalence of Acanthamoeba is about 1% to 3% of infectious keratitis.

• #1 Keratitis: Types, Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/24500-keratitis

  Keratitis can have infectious or noninfectious causes. […] Keratitis can be divided into two categories based on cause: infectious keratitis or noninfectious keratitis. Some people call infectious keratitis microbial keratitis. […] There are infectious and noninfectious causes of keratitis. […] Causes of infectious keratitis include: Bacterial keratitis: This type, caused by bacteria, is the most common. Fungal keratitis: This type is caused by fungi, often from plants. Parasitic keratitis: Parasites are organisms that live off another organism. Acanthamoeba keratitis is caused by a one-celled parasite called an amoeba. Viral keratitis: Viruses like the ones that cause shingles and herpes simplex can cause keratitis. Herpes simplex keratitis often recurs. […] Causes of noninfectious keratitis include: Injuring your eye. (This includes having eye surgery, being in an accident and having a condition where your eyelashes scrape against the surface of your eye.) Wearing contact lenses for too long. Having a foreign object in your eye. Being exposed to ultraviolet (UV) light for too long. Having a vitamin A deficiency. Having an eyelid disorder or immune system condition that causes dry eyes.

• #1 Corneal Ulcer: Symptoms, Causes & Treatment

  https://my.clevelandclinic.org/health/diseases/22524-corneal-ulcer

  Parasites. Acanthamoeba family parasites are the most common cause of parasitic infection-related corneal ulcers. These parasites are a major risk for people who swim while wearing contacts. […] Noninfectious causes. These are conditions or circumstances that can cause corneal ulcers without an infection. Examples include: […] Eye injuries. Burns, scratches (corneal abrasions), cuts (lacerations) and punctures can all lead to ulcers when they dont heal correctly. […] Exposure. If you cant close your eyes fully (a condition called lagophthalmos), that leaves your corneas exposed for much longer than they should be. […] Very dry eyes. This can be because of weather conditions, eye conditions or a combination of the two. […] Toxic effects. These can be from toxic substances or, more rarely, from medications youre taking.

• #1 Keratitis | AOA

  https://www.aoa.org/healthy-eyes/eye-and-vision-conditions/keratitis

  Keratitis may or may not be associated with an infection. […] Noninfectious keratitis can be caused by an eye injury, by wearing contact lenses too long or by a foreign body in the eye. […] Infectious keratitis can be caused by bacteria, viruses, fungi and parasites. […] Wearing contact lenses increases the risk of developing infectious and noninfectious keratitis, especially if slept in them. […] Eye Injurymechanical (scratch) or chemical (fumes or liquids splashed in the eye). […] Bacteria. […] Viruses, most commonly Herpes Simplex. […] Fungus. […] Conditions and medications that cause a reduced immune system. […] Treatment of keratitis depends on the cause of the inflammation or infection. […] In mild cases, eye drops (antibiotic, antiviral or antifungal, determined by the cause of the infection) are prescribed.

• #1 Bacterial Keratitis – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK574509/

  Contact lens use is one of the major causes of bacterial keratitis. The various factors which cause bacterial keratitis are contact lens (CL) overnight wear, overwear, inadequate cleaning of contact lens, rinsing the contact lens in tap water, contamination, lack of CL hygiene, bandage contact lenses, CL sharing, swimming with contact lenses, CL solution contamination, and CL induced trauma. […] The various extrinsic causes implicated are trauma, foreign body injury, chemical, mechanical and thermal injuries, insect fall, previous ocular and eyelid surgery, immunosuppression, drug-induced with corticosteroids and NSAIDs and substance abuse. […] Varied ocular surface diseases, either local or systemic, can also result in bacterial keratitis. The various local factors are dry eyes, corneal suture-related infection, abnormalities of eyelid anatomy and function, trichiasis, blepharitis, chronic dacryocystitis, ectropion, entropion conjunctivitis, lagophthalmos neurotrophic keratopathy, recurrent corneal erosions, epithelial defect, secondary bacterial keratitis after viral keratitis, bullous keratopathy.

• #1 What Causes Bacterial Keratitis | Healthy Contact Lens Wear and Care | CDC

  https://www.cdc.gov/contact-lenses/causes/what-causes-contact-lens-related-bacterial-keratitis.html

  Bacterial keratitis is an infection of the cornea (the clear dome covering the colored part of the eye) that is caused by bacteria. […] Types of bacteria that commonly cause bacterial keratitis include: Pseudomonas aeruginosa, Staphylococcus aureus. […] Risks for developing bacterial keratitis include: Wearing contact lenses, especially: Overnight wear, Temporary reshaping of the cornea from wearing a rigid contact lens, Not disinfecting contact lenses well, Not cleaning contact lens cases, Storing or rinsing contact lenses in water, Using visibly contaminated lens solution, „Topping off” lens solution rather than discarding used solution and replacing, Sharing colored or decorative contact lenses. […] Contact lenses are medical devices, and failure to wear, clean, and store them as directed can increase the risk of eye infections, such as microbial keratitis.

• #1 Bacterial Keratitis Clinical Presentation: History, Physical, Causes

  https://emedicine.medscape.com/article/1194028-clinical

  Patients with bacterial keratitis usually complain of rapid onset of pain, photophobia, and decreased vision. It is important to document a complete systemic and ocular history in these patients to identify any potential risk factors that would have made them susceptible to develop this infection, including the following: […] Any factor or agent that creates a breakdown of the corneal epithelium is a potential cause or risk factor for bacterial keratitis. Furthermore, exposure to some virulent bacteria that may penetrate intact epithelium (eg, Neisseria gonorrhoeae) also may result in bacterial keratitis. […] By far the most common cause of trauma to the corneal epithelium and the main risk factor for bacterial keratitis is the use of contact lenses, particularly extended-wear contact lenses. Of patients with bacterial keratitis, 19-42% are contact lens wearers. Incidence of bacterial keratitis secondary to use of extended-wear contact lenses is about 8,000 cases per year. The annual incidence of bacterial keratitis with daily-wear lenses is 3 cases per 10,000.

• #1 Explains Keratitis, an inflammation of the cornea – Prevent Blindness

  https://preventblindness.org/keratitis/

  Keratitis resulting from infections (called infectious keratitis) can be caused by bacteria, viruses, fungi, and parasites. […] Keratitis can also occur as a result of other insults to the cornea (called noninfectious keratitis) such as an injury, wearing your contact lenses too long, or very dry eye. […] Keratitis can be infectious or non-infectious. […] Bacterial keratitis is common in people who wear contact lenses. […] The two biggest risk factors to get an Acanthamoeba infection are poor contact lens hygiene and exposure to water (like swimming pools and hot tubs) while wearing contact lenses. […] Scratches, scrapes and cuts to your cornea can cause noninfectious keratitis. […] The eyes are not able to leave a protective layer of tears (called the tear film) that washes, soothes and protects the eye every time you blink.

• #1 Keratitis – Harvard Health

  https://www.health.harvard.edu/a_to_z/keratitis-a-to-z

  Non-infectious keratitis is a feature of some autoimmune diseases, such as rheumatoid arthritis and Sjogren’s syndrome. In these conditions, keratitis is often a complication of eye dryness. […] Trauma to the front of the eye, as may occur with poorly fitting contact lenses, surgery on the cornea (including LASIK surgery), or any other injury to the cornea may lead to keratitis. […] People who wear contact lenses are at increased risk for infectious keratitis. Lens wear should stop immediately if a person suspects that he or she is developing an eye infection. […] Keratitis caused by autoimmune disease, some parasites or prior injury can be difficult to treat and may be long lasting (chronic). In these cases, permanent damage to the cornea with impaired vision may occur despite intense treatment.

• #1 Keratitis Causes, Treatment, Diagnosis, Types & NHS Symptoms

  https://www.medicinenet.com/keratitis/article.htm

  Fungi such as Candida, Aspergillus, and Nocardia are unusual causes of microbial keratitis, more frequently occurring in people who are immunocompromised because of underlying illnesses or medications. […] Physical or chemical trauma is a frequent cause of keratitis. […] Disturbances in the tear film may lead to changes in the corneal surface through drying of the corneal epithelium. […] Disorders of the eyelids or eyelashes may also cause keratitis. […] Allergies to airborne pollens or bacterial toxins in the tears may also cause a noninfectious type of keratitis. Autoimmune diseases create a similar appearance, often affecting the periphery of the cornea, termed marginal keratitis or limbic keratitis.

• #1 Superficial Punctate Keratitis – Eye Disorders – Merck Manual Consumer Version

  https://www.merckmanuals.com/home/eye-disorders/corneal-disorders/superficial-punctate-keratitis

  Superficial punctate keratitis is an eye disorder caused by death of small groups of cells on the surface of the cornea (the clear layer in front of the iris and pupil). […] The cause of superficial punctate keratitis may be any of the following: A viral infection, Blepharitis (eyelid inflammation), Dry eyes, A bacterial infection (including trachoma), Strong chemicals splashed in the eye, Exposure to ultraviolet light (sunlight, sunlamps, or welding arcs), Prolonged use of contact lenses, A side effect of certain medications taken by mouth (orally) or by vein (intravenously), An allergy to eye drops, Bell palsy. […] Treatment depends on the cause.

• #1 Pigmentary Keratitis | VCA Animal Hospitals

  https://vcahospitals.com/know-your-pet/pigmentary-keratitis

  Pigmentary keratitis is caused by chronic irritation or inflammation of the eye. […] Common causes of eye inflammation that can result in pigmentary keratitis include diseases of the eyelid, such as entropion (inwardly-rolled eyelid), ectropion (outwardly-rolled eyelid), abnormal eyelashes, or eyelid tumors. […] Pigmentary keratitis can also be associated with keratoconjunctivitis sicca (KCS) or dry eye. […] In some cases, no underlying cause can be identified. […] These factors suggest a genetic component to this condition.

• #1 Exposure Keratitis | Vagelos College of Physicians and Surgeons

  https://www.vagelos.columbia.edu/departments-centers/ophthalmology/education/digital-reference-ophthalmology/cornea-and-external-diseases/non-infectious/exposure-keratitis

  May result from any disease process that causes inadequate eyelid closure. […] Causes include: Neurogenic diseases such as Bell’s palsy, acoustic neuroma. […] Proptosis due to thyroid orbitopathy or other orbital diseases. […] Eyelid dysfunction from restrictive eyelid diseases or previous blepharoplasty. […] Inattentive mental states such as in comatose patients or nocturnal exposure.

• #1 Explains Keratitis, an inflammation of the cornea – Prevent Blindness

  https://preventblindness.org/keratitis/

  Photokeratitis is caused by damage to the cornea by UV light. […] Keratitis, if caught early, is usually easy to treat and clears up quickly. […] Corneal scarring is the most common complication of keratitis, which can lead to vision loss. […] If keratitis is not treated in a timely manner, the infection could go through the cornea and spread to other areas of the eye leading to possible blindness.

• #1 What Causes Keratitis Eye Disease? | What is Keratitis?

  https://www.optegra.com/eye-health-blog/eye-health-care/what-causes-keratitis-eye-disease/

  Keratitis can result from a variety of causes, which fall into two broad categories: infectious and non-infectious. […] Infectious causes include bacteria, viruses (such as herpes simplex), fungi, and parasites like Acanthamoeba. These are often linked to improper contact lens use or exposure to contaminated water. […] Non-infectious causes include eye injuries, glaucoma treatments (particularly those containing preservatives) and Ultraviolet (UV) light exposure (e.g. gazing at a solar eclipse or the use of tanning beds). These factors can trigger corneal inflammation without bacterial, viral, or fungal infection. […] Non-infectious keratitis can result from traumatic eye injuries, contact lens complications, environmental factors (UV exposure, allergens), autoimmune conditions, systemic nutritional deficiencies, eyelid dysfunction, and dry eye syndrome.

• #1 Superficial Punctate Keratitis – Eye Disorders – Merck Manual Professional Edition

  https://www.merckmanuals.com/professional/eye-disorders/corneal-disorders/superficial-punctate-keratitis

  Superficial punctate keratitis is corneal inflammation of diverse causes characterized by scattered, fine, punctate corneal epithelial loss or damage. […] Causes may include any of the following: Viral conjunctivitis (most commonly adenovirus), Blepharitis, Keratoconjunctivitis sicca, Trachoma, Chemical burns, Ultraviolet (UV) light exposure (eg, welding arcs, sunlamps, snow glare), Contact lens overwear, Systemic medications (eg, adenine arabinoside), Topical medication or preservative toxicity, Peripheral facial nerve palsy (including Bell palsy). […] Ultraviolet (UV) B light (wavelength 300 nm) can burn the cornea, causing keratitis or keratoconjunctivitis. Arc welding is a common cause; even a brief, unprotected glance at a welding arc may result in a burn. Other causes include high-voltage electric sparks, artificial sun lamps, and sunlight reflected off snow at high altitudes. […] Diagnosis is by history, presence of superficial punctate keratitis, and absence of a foreign body or infection.

• #1 Dangerous Causes Of Keratitis And Their Impact On Your Eyes

  https://www.cheapmedicineshop.com/blog/eyecare/keratitis-causes/

  Certain allergic reactions, especially when accompanied by excessive eye rubbing, can lead to the development of Interstitial Keratitis. […] Various microorganisms, including bacteria, fungi, and parasites, often cause Ulcerative Keratitis. […] Bacterial infections such as Bacterial Keratitis and bacterial pink eye are common causes of Ulcerative Keratitis. […] Fungal Keratitis is another source of Ulcerative Keratitis. […] Herpes Simplex Virus (HSV) is a common cause of Keratitis. […] Dry Eye Syndrome can also cause Keratitis due to insufficient tears. […] Conditions such as Rosacea and Atopic Dermatitis can cause inflammation of the eyelids and Conjunctiva. […] Common infectious causes of Keratitis include bacteria, viruses, fungi, and parasites. […] Non-infectious causes of Keratitis include exposure to irritants, such as chemicals, foreign objects, and ultraviolet radiation.

• #1 Interstitial keratitis: MedlinePlus Medical EncyclopediaLock

  https://medlineplus.gov/ency/article/001609.htm

  Interstitial keratitis is a serious condition in which blood vessels grow into the cornea. Such growth can cause loss of the normal clearness of the cornea. This condition is often caused by infections. […] Syphilis is the most common cause of interstitial keratitis, but rare causes include: Autoimmune diseases, like rheumatoid arthritis and sarcoidosis, Leprosy, Lyme disease, Tuberculosis. […] In the United States, most cases of syphilis are recognized and treated before this eye condition develops. […] However, interstitial keratitis accounts for 10% of avoidable blindness in the least developed countries worldwide.

• #1 Keratitis | Causes, Symptoms & Treatment | Britannica

  https://www.britannica.com/science/keratitis

  Rosacea keratitis is a complication of acne rosacea, a disease in which the skin of the face is affected first by pronounced flushing and later by the formation of nodules and pustules. […] Neuroparalytic keratitis is inflammation of the cornea as a sequel to interruption of sensory impulses over the fifth (trigeminal) cranial nerve. […] Other possible causes of keratitis are numerous and include reactions to topical eye medications, toxin exposure, infection and inflammation of the eyelid margins (blepharitis), and various allergic conditions.

• #1 Neurotrophic Keratitis – EyeWiki

  https://eyewiki.org/Neurotrophic_Keratitis

  Every ocular or systemic condition altering corneal sensory innervation which runs from the cornea itself to the pontine trigeminal nucleus can result in NK. […] Most common ocular conditions associated with NK are herpetic keratitis (zoster and simplex), topical anesthetic abuse, chemical and thermal burns, contact lens abuse, topical drug toxicity, irradiation to eye or adnexa, and corneal surgery. […] Chronic use of topical medications containing benzalkonium chloride (BAK) may reduce corneal sensation via nerve damage and impair corneal epithelial healing. […] With regards to corneal procedures, corneal refractive procedures, such as laser in situ keratomileusis (LASIK) and photorefractive keratectomy (PRK), have been linked to NK. […] Non-corneal causes include neurosurgical procedures or trauma damaging the fifth cranial nerve, stroke, aneurysms, multiple sclerosis, intracranial masses (e.g. acoustic neuroma), diabetes (NK has been described as the sole sign of diabetes in a patient), leprosy, vitamin A deficiency, and drugs (narcoleptics and antipsychotics). Congenital hypoplasia of the trigeminal nerve has also been described in association with NK.

• #1 Keratitis: Symptoms, Causes, Diagnosis and Treatment | MedPark Hospital

  https://www.medparkhospital.com/en-US/disease-and-treatment/keratitis

  Extended contact lens wear leads to eye damage and increased susceptibility to infection. […] Inadequate cleaning or disinfection of contact lenses can also cause keratitis. […] Wearing lenses while immersed in pools, bathtubs, or outdoor water sources increases the risk of keratitis. […] Long-term use of corticosteroids and a weakened immune system are additional risk factors.

• #1 Infectious keratitis: an update on epidemiology, causative microorganisms, risk factors, and antimicrobial resistance | Eye

  https://www.nature.com/articles/s41433-020-01339-3

  IK may occur following various ocular surgeries, including corneal transplant, refractive surgery, CXL, pterygium surgery, cataract surgery, and others. […] Corneal transplant serves as the main sight-restoring surgery for a wide range of corneal diseases, though postoperative complications such as graft failure and IK may develop. […] Topical steroids can sometimes act as a double-edge sword. […] Systemic immunosuppression, either secondary to diseases or immunosuppressive agents, has been shown to increase the risk of IK.

• #1 Keratitis: Types, Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/24500-keratitis

  One major risk factor for keratitis is wearing contact lenses. This is related to: Wearing them longer than you’re supposed to wear them. This can cause damage to your eye and possibly allow infection to enter. Not cleaning / disinfecting them properly. Wearing them while you’re in pools, hot tubs or outdoor water sources.

• #1 What is keratitis? | New York Eye & Ear

  https://www.nyee.edu/care/eye/cornea/diseases/infection-inflammation

  Other contributing factors that may impact the severity of the case include the degree of trauma, the presence of underlying ocular surface disease, the use of topical steroids or contact lenses, host immune response, and the time it took to diagnosis and begin treatment. […] The most common risk factors for keratitis include: Contact lenses: Wearing contact lenses increases your risk of both infectious and noninfectious keratitis. […] Impaired or reduce immunity: If your immune system is weakened either from local or systemic disease (i.e., cancer, diabetes, or autoimmune diseases such as lupus or rheumatoid arthritis) or through use of medications (anticancer medications or oral steroids) your risk of developing keratitis is higher. […] Use of topical corticosteroids: The use of corticosteroid eye drops to treat other ocular disease increases your risk of developing keratitis or worsening an existing case. […] Eye injury/ocular trauma: If one of your corneas is injured severely or has been damaged from an injury in the past, you may be more vulnerable to developing keratitis.

• #1 Culture-negative Keratitis Causes Less Severe Infection

  https://www.reviewofoptometry.com/article/culturenegative-keratitis-causes-less-severe-infection

  Culture-negative bacterial keratitis had less severe infection and better outcomes when compared with positive cultures. […] The microbiology of bacterial keratitis is not consistent worldwide as it is affected by geographic and economic factors, but it has been shown that the most common causative organisms are similar across the globe with a higher percentage of gram-positive infections. […] Gram-positive bacteria were found to be the causative organism in 106 cases (62.8%) in agreement with previous studies that found these bacteria to be the most frequent cause of microbial keratitis. […] The other factor that may have contributed to the high rates of Pseudomonas is the large percentage of contact lens wearers (24.7%). […] Culture-positive bacterial keratitis was associated with the development of anterior chamber reaction on multivariate analysis. […] Gram-positive bacteria were the most common causative organisms in our sample, the investigators concluded. […] Factors associated with poor outcome in the present study included diabetes, poor presenting visual acuity and positive cultures.

• #1 Bacterial and fungal causes of infectious keratitis among patients attending Research Institute of Ophthalmology | Bulletin of the National Research Centre | Full Text

  https://bnrc.springeropen.com/articles/10.1186/s42269-020-00330-y

  In the present study, the bacterial growth among positive culture cases is 7/30 (23%); 3/7 were S. aureus, 3/7 was Pseudomonas spp., and the remaining isolate was S. pneumoniae. […] Proper diagnosis and treatment of bacterial keratitis are essential to achieve resolution of infection and minimize damage to the cornea. […] Treatment of fungal keratitis is one of the most difficult problems encountered by ophthalmologists due to poor response to the therapy as well as the limited availability of antifungal agents. […] In this study, antifungal susceptibility pattern of the 23 fungal isolates revealed that all isolates are 100% susceptible to ketoconazole and voriconazole. […] Ocular trauma was the major cause of infectious keratitis. It was more in the rural population. Fungal growth, mainly Aspergillus spp. was the most prevalent pathogen encountered in all cases. The incidence of fungal keratitis is on the rise due to increased global warming.

• #1 Keratitis – Harvard Health

  https://www.health.harvard.edu/a_to_z/keratitis-a-to-z

  Treatment of keratitis depends upon the cause. If there is mild injury to the cornea, such as a scratched cornea, no specific treatment is necessary. An antibiotic ointment might be prescribed. This is done mostly for comfort. […] If the keratitis is caused by herpes simplex or the herpes zoster virus that causes shingles, your doctor will prescribe antiviral eye drops or an antiviral oral medication or both. Bacterial keratitis needs to be treated with antibiotics. Depending on the severity of the infection, an oral antibiotic may be prescribed along with an antibiotic ointment or eye drops. Topical and systemic treatments are available for fungal keratitis.

• #2 Keratitis: Symptoms, Causes, Diagnosis and Treatment | MedPark Hospital

  https://www.medparkhospital.com/en-US/disease-and-treatment/keratitis

  Keratitis is an inflammation of the cornea. It can arise from infectious or noninfectious origins. […] Bacteria, viruses, fungi, or parasites can cause infectious keratitis. […] Noninfectious keratitis may result from minor injuries such as prolonged wearing of contact lenses or foreign objects entering the eye. […] Occasionally, keratitis develops in patients with systemic autoimmune diseases such as rheumatoid arthritis. […] Causes of infectious keratitis include bacteria, viruses such as shingles or herpes simplex, fungi, and parasites such as amoeba. […] Causes of noninfectious keratitis include eye injury from surgery, accident, or eyelashes scraping the eye surface, prolonged use of contact lenses, foreign object in the eye, excessive UV ray exposure, eyelid disorders, and vitamin A deficiency.

• #2 Infectious keratitis: an update on epidemiology, causative microorganisms, risk factors, and antimicrobial resistance | Eye

  https://www.nature.com/articles/s41433-020-01339-3

  Corneal opacity is the 5th leading cause of blindness and visual impairment globally, affecting ~6 million of the world population. […] Among all aetiologies such as infection, trauma, inflammation, degeneration and nutritional deficiency, infectious keratitis (IK) represents the leading cause of corneal blindness in both developed and developing countries, with an estimated incidence ranging from 2.5 to 799 per 100,000 population-year. […] IK can be caused by a wide range of microorganisms, including bacteria, fungi, virus, parasites and polymicrobial infection. […] Subject to the geographical and temporal variations, bacteria and fungi have been shown to be the most common causative microorganisms for corneal infection. […] Although viral and Acanthamoeba keratitis are less common, they represent important causes for corneal blindness in the developed countries.

• #2 Bacterial Keratitis – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK574509/

  The most common species causing bacterial keratitis include Staphylococcus aureus, Staphylococcus epidermidis, Streptococcus pneumoniae, Pseudomonas aeuruginosa, and species of the Enterobacteriaceae family. […] The bacterial species that can penetrate the intact corneal epithelium are Neisseria gonorrhoeae, Corynebacterium diphtheriae, Hemophilus aegyptius, and Listeria monocytogenes.

• #2 What Causes Bacterial Keratitis | Healthy Contact Lens Wear and Care | CDC

  https://www.cdc.gov/contact-lenses/causes/what-causes-contact-lens-related-bacterial-keratitis.html

  Bacterial keratitis is an infection of the cornea (the clear dome covering the colored part of the eye) that is caused by bacteria. […] Types of bacteria that commonly cause bacterial keratitis include: Pseudomonas aeruginosa, Staphylococcus aureus. […] Risks for developing bacterial keratitis include: Wearing contact lenses, especially: Overnight wear, Temporary reshaping of the cornea from wearing a rigid contact lens, Not disinfecting contact lenses well, Not cleaning contact lens cases, Storing or rinsing contact lenses in water, Using visibly contaminated lens solution, „Topping off” lens solution rather than discarding used solution and replacing, Sharing colored or decorative contact lenses. […] Contact lenses are medical devices, and failure to wear, clean, and store them as directed can increase the risk of eye infections, such as microbial keratitis.

• #2 Bacterial Keratitis: Background, Pathophysiology, Epidemiology

  https://emedicine.medscape.com/article/1194028-overview

  Bacterial keratitis is a serious ocular problem that can, if not appropriately treated, lead to sight-threatening complications such as corneal scarring, perforation, endophthalmitis, and, ultimately, blindness. A particular feature of bacterial keratitis is its rapid progression; corneal destruction may be complete in 24-48 hours with some of the more virulent bacteria. […] The most common groups of bacteria responsible for bacterial keratitis are as follows: Streptococcus, Pseudomonas, Enterobacteriaceae (including Klebsiella, Enterobacter, Serratia, and Proteus), and Staphylococcus species. […] Up to 20% of cases of fungal keratitis (particularly candidiasis) are complicated by bacterial coinfection.

• #2 Bacterial Keratitis – EyeWiki

  https://eyewiki.org/Bacterial_Keratitis

  Bacterial keratitis is a serious bacterial infection of the cornea which can, in severe cases, cause loss of vision. […] Although infectious ulcers may also be due to fungi, viruses, mycobacteria and protozoa, bacteria are the most common cause of infectious keratitis. Both gram positive and gram negative organisms are implicated as causative agents. About 80 % of bacterial keratitis is caused by Staphylococcus, Streptococcus and Pseudomonas species, though prevalence can depend on geographical regions. Certain bacteria are known to penetrate the intact epithelium which include Neisseria, Corynebacterium, Shigella and Listeria. Polymicrobial infections can occur, up to 43% in one study. […] Corneal infections rarely occur in the normal eye. They are a result of an alteration in the corneas defense mechanisms that allow bacteria to invade when an epithelial defect is present. The organisms may come from the tear film or as a contaminant from foreign bodies, contact lenses or irrigating solutions. The severity of the disease depends on the strain of the organism, the size of the inoculum, the susceptibility of the host and immune response, the antecedent therapy, and the duration of the infection. […] The prognosis depends on the size, location, depth, and etiology of the corneal ulcer as well as any pre-existing ocular conditions.

• #2 Keratitis – Uveitis.org | OIUF

  https://uveitis.org/patient_articles/keratitis/

  Keratitis may occur as a result of a wide variety of stimuli, but by far the most common is infection. […] Interestingly, the most common microbe causing corneal infections is herpes simplex virus. […] Autoimmune diseases, particular those with components involving vasculitis, or inflammation of blood vessels, can cause inflammation especially around the outside edges of the cornea, known as peripheral keratitis. […] Additionally, problems such as dry eye and abnormal eyelid function, which lead to poor corneal health, can lead to keratitis by making the corneal more susceptible to infection or other types of inflammation. […] Aside from herpes, bacterial and fungal infections can cause severe keratitis requiring aggressive treatment and sometimes surgery. […] Auto-immune diseases, especially rheumatoid arthritis and types of vasculitis, can be a risk factor for developing keratitis and dangerous thinning of the cornea which may also require surgery.

• #2 Keratitis: Types, Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/24500-keratitis

  Keratitis can have infectious or noninfectious causes. […] Keratitis can be divided into two categories based on cause: infectious keratitis or noninfectious keratitis. Some people call infectious keratitis microbial keratitis. […] There are infectious and noninfectious causes of keratitis. […] Causes of infectious keratitis include: Bacterial keratitis: This type, caused by bacteria, is the most common. Fungal keratitis: This type is caused by fungi, often from plants. Parasitic keratitis: Parasites are organisms that live off another organism. Acanthamoeba keratitis is caused by a one-celled parasite called an amoeba. Viral keratitis: Viruses like the ones that cause shingles and herpes simplex can cause keratitis. Herpes simplex keratitis often recurs. […] Causes of noninfectious keratitis include: Injuring your eye. (This includes having eye surgery, being in an accident and having a condition where your eyelashes scrape against the surface of your eye.) Wearing contact lenses for too long. Having a foreign object in your eye. Being exposed to ultraviolet (UV) light for too long. Having a vitamin A deficiency. Having an eyelid disorder or immune system condition that causes dry eyes.

• #2 Keratitis: What to Do to Save Your Sight

  https://www.webmd.com/eye-health/keratitis-facts

  Keratitis is painful inflammation of your cornea — the clear covering over the pupil and colored part of your eye. Doctors sometimes use the term „corneal ulcer.” It’s usually caused by an injury or infection. […] Several things can lead to keratitis: […] Injury: Most of the time, keratitis comes from damage to your cornea. You might have been poked in the eye or scratched your eye with your fingernail. It also can happen if you wear your contact lenses too long or wear lenses that don’t fit right. The injury may cause the inflammation, but it can also let in bacteria or a fungus that leads to an infection. […] Viral infection: This is usually herpes simplex, the chicken pox virus, or the common cold. If you’re sick, be careful about touching your eyes and keep your hands clean. […] Bacterial infection: This happens less often, but it can be a problem for people who wear contact lenses. Bacteria can grow on your contacts or contact case if you don’t clean and store them properly. Extended-wear lenses, the kind you sleep in for days or even weeks at a time, are most likely to lead to this. Infection can also come from contaminated eye drops or contact solution. Or it can happen after eye surgery.

• #2 Keratitis – Harvard Health

  https://www.health.harvard.edu/a_to_z/keratitis-a-to-z

  Keratitis is an inflammation of the cornea, the outermost part of the eye that covers the pupil and iris (the colored ring around the pupil). The most common causes of keratitis are eye dryness, infection and injury. […] Bacterial, viral, parasitic and fungal infections can cause keratitis. An infectious keratitis can happen after an injury to the cornea. But an injury can inflame the cornea without an infection occurring. […] Viral keratitis occurs quite commonly and the types of viruses include: adenovirus, which is one of the causes of upper respiratory infections; herpes simplex type 1, the same virus that causes cold sores; varicella zoster (also a herpes virus), which is associated with chickenpox and shingles. […] Bacterial keratitis occurs less often than viral keratitis. Parasitic and fungal keratitis is rarely seen in developed countries.

• #2 Understanding Herpes Keratitis: Causes, Symptoms, and Treatment – Burman & Zuckerbrod Ophthalmology Associates

  https://www.2020detroit.com/understanding-herpes-keratitis/

  Herpes keratitis is primarily caused by HSV-1, the same virus responsible for cold sores. Less commonly, HSV-2, typically associated with genital herpes, can also cause the condition. […] The virus is highly contagious and can be transmitted through direct contact with an infected persons skin, saliva, or other bodily fluids. Once the herpes simplex virus infects a person, it can remain dormant in the body and reactivate later, often triggered by factors such as stress, illness, or exposure to sunlight.

• #2 Bacterial and fungal causes of infectious keratitis among patients attending Research Institute of Ophthalmology | Bulletin of the National Research Centre | Full Text

  https://bnrc.springeropen.com/articles/10.1186/s42269-020-00330-y

  Fungal growth was the most prevalent pattern of growth among culture positive cases 23/30 (77%) with Aspergillus spp. being the most prevalent 21/23(91%) followed by Fusarium spp. 2/23 (9%). Bacterial growth among culture positive cases was 7/30 (23%); 3/7 were S. aureus, 3/7 was Pseudomonas spp. and the remaining isolate was Streptococcal pneumoniae. […] The type of isolated pathogens of keratitis in relation to demographic characteristics among the studied populations was as follows: […] Regarding predisposing factors in relation to causative agent of infectious keratitis, ocular trauma was the most common predisposing factor with the positive culture cases 11/30 (37%) of the patients. […] The incidence of fungal keratitis is on the rise in the densely populated continents of Asia and Africa. This can be explained by the difference in climatic conditions.

• #2 Keratitis: Symptoms, Causes, and Treatments

  https://www.visioncenter.org/conditions/keratitis/

  Keratitis is divided into two main types: infectious keratitis (microbial keratitis) and noninfectious keratitis. Infectious keratitis is caused by bacteria, fungi, viruses, or parasites. […] On the other hand, noninfectious keratitis is caused by physical trauma, weak immunity, or exposure to extreme environmental elements. […] Infectious keratitis is a leading cause of vision impairment and blindness worldwide, disproportionately impacting marginalized populations. […] Bacterial keratitis. Caused by bacteria such as Pseudomonas aeruginosa and Staphylococcus aureus. Occurs due to improper or unhygienic use of contact lenses. […] Fungal keratitis. Caused by fungi like Candida species, Fusarium and Aspergillus. It occurs due to eye trauma, improper contact lens use, and underlying diseases. Its also common in tropical and subtropical environments.

• #2 Keratitis Causes, Treatment, Diagnosis, Types & NHS Symptoms

  https://www.medicinenet.com/keratitis/article.htm

  Fungi such as Candida, Aspergillus, and Nocardia are unusual causes of microbial keratitis, more frequently occurring in people who are immunocompromised because of underlying illnesses or medications. […] Physical or chemical trauma is a frequent cause of keratitis. […] Disturbances in the tear film may lead to changes in the corneal surface through drying of the corneal epithelium. […] Disorders of the eyelids or eyelashes may also cause keratitis. […] Allergies to airborne pollens or bacterial toxins in the tears may also cause a noninfectious type of keratitis. Autoimmune diseases create a similar appearance, often affecting the periphery of the cornea, termed marginal keratitis or limbic keratitis.

• #2 What is Keratitis? Causes, Treatment and Prevention

  https://www.nvisioncenters.com/conditions/keratitis/

  Keratitis can come from a variety of sources. The same bacteria that cause gonorrhea can cause one form of keratitis, as can HSV and shingles. Some of the most common ways a person gets keratitis are an improper contact lens routine and swimming in contaminated water. […] Of all the forms of keratitis, one of the worst to contract is parasitic keratitis, which is caused by the parasite acanthamoeba. […] You can be infected with keratitis in a number of ways. […] Contaminated water: Water can hold fungi, bacteria, or parasites, all of which can cause keratitis. […] Bacteria: The bacteria that cause gonorrhea can cause keratitis. […] Herpes: Herpes simplex virus (HSV) and shingles can both cause keratitis. […] Injury: Scratches to the cornea can lead to noninfectious keratitis. An injury can also expose the eye to other microorganisms, which can in turn lead to infectious keratitis.

• #2 What Causes Keratitis Eye Disease? | What is Keratitis?

  https://www.optegra.com/eye-health-blog/eye-health-care/what-causes-keratitis-eye-disease/

  Extended or overnight wear of contact lenses may lead to Keratitis. This happens because the cornea is deprived of oxygen, weakening its defences and being prone to contamination and infection. […] Wearing contact lenses while swimming, such as in pools, hot tubs, or natural bodies of water, can lead to harmful microorganisms clinging to contact lenses causing contamination of the cornea. This keratitis (bacterial or acanthamoeba keratitis) is very dangerous and can lead to blindness.

• #2 Explains Keratitis, an inflammation of the cornea – Prevent Blindness

  https://preventblindness.org/keratitis/

  Keratitis resulting from infections (called infectious keratitis) can be caused by bacteria, viruses, fungi, and parasites. […] Keratitis can also occur as a result of other insults to the cornea (called noninfectious keratitis) such as an injury, wearing your contact lenses too long, or very dry eye. […] Keratitis can be infectious or non-infectious. […] Bacterial keratitis is common in people who wear contact lenses. […] The two biggest risk factors to get an Acanthamoeba infection are poor contact lens hygiene and exposure to water (like swimming pools and hot tubs) while wearing contact lenses. […] Scratches, scrapes and cuts to your cornea can cause noninfectious keratitis. […] The eyes are not able to leave a protective layer of tears (called the tear film) that washes, soothes and protects the eye every time you blink.

• #2 Understanding Keratitis: Causes And Effective Treatments

  https://flei.com/keratitis-causes-and-treatments/

  Keratitis that occurs as a result of an infection is called infectious keratitis. […] It is common in contact lens wearers who do not practice proper lens hygiene and maintenance. […] In other cases, it can be brought on by a viral infection like shingles or the common cold. […] Bacterial infection-related keratitis is common in patients using extended-wear lenses. […] The viruses that cause the common cold and shingles (varicella virus) can also cause corneal ulcers. […] Noninfectious keratitis occurs as a result of abrasions to the cornea. […] In some cases, it can be caused by eyelid disorders, dry eyes, or an injury. […] Certain eyelid disorders like entropion or ectropion, which prevent the eyelid from properly functioning, can lead to corneal ulcers. […] Patients who suffer from dry eye syndrome may also suffer from keratitis. […] Corneal abrasions like scratches or scrapes from fingernails, tree branches, and makeup brushes, can result in noninfectious keratitis. […] In some cases, these injuries can cause an increased risk of infectious keratitis if not quickly treated.

• #2 Infectious keratitis: an update on epidemiology, causative microorganisms, risk factors, and antimicrobial resistance | Eye

  https://www.nature.com/articles/s41433-020-01339-3

  IK may occur following various ocular surgeries, including corneal transplant, refractive surgery, CXL, pterygium surgery, cataract surgery, and others. […] Corneal transplant serves as the main sight-restoring surgery for a wide range of corneal diseases, though postoperative complications such as graft failure and IK may develop. […] Topical steroids can sometimes act as a double-edge sword. […] Systemic immunosuppression, either secondary to diseases or immunosuppressive agents, has been shown to increase the risk of IK.

• #2 Keratitis: Types, Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/24500-keratitis

  One major risk factor for keratitis is wearing contact lenses. This is related to: Wearing them longer than you’re supposed to wear them. This can cause damage to your eye and possibly allow infection to enter. Not cleaning / disinfecting them properly. Wearing them while you’re in pools, hot tubs or outdoor water sources.

• #2 Keratitis: Symptoms, Causes, Diagnosis and Treatment | MedPark Hospital

  https://www.medparkhospital.com/en-US/disease-and-treatment/keratitis

  Extended contact lens wear leads to eye damage and increased susceptibility to infection. […] Inadequate cleaning or disinfection of contact lenses can also cause keratitis. […] Wearing lenses while immersed in pools, bathtubs, or outdoor water sources increases the risk of keratitis. […] Long-term use of corticosteroids and a weakened immune system are additional risk factors.

• #2 Keratitis – Optometrists.org

  https://www.optometrists.org/general-practice-optometry/guide-to-eye-conditions/guide-to-corneal-diseases/keratitis/

  Viral keratitis is primarily caused by the herpes simplex virus, which can progress from conjunctivitis to keratitis. […] Noninfectious keratitis is commonly caused by wearing your contacts too many hours a day, using extended-wear contacts, especially past their expiration date, wearing your contacts while swimming, exposure to intense sunlight, called photo keratitis, eye injury, such as a scratch, weakened immune system, and living in a warm climate, which increases the risk of plant materials damaging your cornea. […] Improper handling of contact lenses is often the reason people develop infectious keratitis. […] Additionally, non-infectious keratitis often results from wearing expired contact lenses, or leaving your lenses in for too many hours each day. […] The incidence of microbial keratitis ranges from 0.4 to 5.2 per 10,000 person-years for rigid gas-permeable and soft contact lens wearers to 20 per 10,000 person-years for overnight soft contact lens wearers. […] Treatment will depend on the underlying cause of your keratitis. Your doctor may prescribe oral medications, eye drops or both.

• #2 Bacterial Keratitis – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK574509/

  Contact lens use is one of the major causes of bacterial keratitis. The various factors which cause bacterial keratitis are contact lens (CL) overnight wear, overwear, inadequate cleaning of contact lens, rinsing the contact lens in tap water, contamination, lack of CL hygiene, bandage contact lenses, CL sharing, swimming with contact lenses, CL solution contamination, and CL induced trauma. […] The various extrinsic causes implicated are trauma, foreign body injury, chemical, mechanical and thermal injuries, insect fall, previous ocular and eyelid surgery, immunosuppression, drug-induced with corticosteroids and NSAIDs and substance abuse. […] Varied ocular surface diseases, either local or systemic, can also result in bacterial keratitis. The various local factors are dry eyes, corneal suture-related infection, abnormalities of eyelid anatomy and function, trichiasis, blepharitis, chronic dacryocystitis, ectropion, entropion conjunctivitis, lagophthalmos neurotrophic keratopathy, recurrent corneal erosions, epithelial defect, secondary bacterial keratitis after viral keratitis, bullous keratopathy.

• #2 Keratitis Guide: Causes, Symptoms and Treatment Options

  https://www.drugs.com/health-guide/keratitis.html

  Non-infectious keratitis is a feature of some autoimmune diseases, such as rheumatoid arthritis and Sjogren’s syndrome. In these conditions, keratitis is often a complication of eye dryness. […] Trauma to the front of the eye, as may occur with poorly fitting contact lenses, surgery on the cornea (including LASIK surgery), or any other injury to the cornea may lead to keratitis. […] People who wear contact lenses are at increased risk for infectious keratitis. Lens wear should stop immediately if a person suspects that he or she is developing an eye infection.

• #2

  https://www.aao.org/eye-health/diseases/corneal-ulcer

  A corneal ulcer usually results from an eye infection, but severe dry eye or other eye disorders can cause it. […] Corneal ulcers are usually caused by the following types of infections: […] Bacterial infections. These are common in contact lens wearers, especially in people using extended-wear lenses. […] Viral infections. The virus that causes cold sores (the herpes simplex virus) may cause recurring attacks. […] Fungal infections. Improper use of contact lenses or steroid eye drops can lead to fungal infections, which in turn can cause corneal ulcers. […] Parasitic (Acanthamoeba) infections. Acanthamoeba are microscopic, single-celled amoeba that can cause human infection. […] Other causes of corneal ulcers include: Abrasions or burns to the cornea caused by injury to the eye. […] Dry eye syndrome. […] Bells palsy and other eyelid disorders that prevent proper eyelid function. If the eyelid does not function properly, the cornea can dry out, and an ulcer can develop.

• #2 Pigmentary Keratitis | VCA Animal Hospitals

  https://vcahospitals.com/know-your-pet/pigmentary-keratitis

  Pigmentary keratitis is caused by chronic irritation or inflammation of the eye. […] Common causes of eye inflammation that can result in pigmentary keratitis include diseases of the eyelid, such as entropion (inwardly-rolled eyelid), ectropion (outwardly-rolled eyelid), abnormal eyelashes, or eyelid tumors. […] Pigmentary keratitis can also be associated with keratoconjunctivitis sicca (KCS) or dry eye. […] In some cases, no underlying cause can be identified. […] These factors suggest a genetic component to this condition.

• #2 Superficial Punctate Keratitis – Eye Disorders – Merck Manual Consumer Version

  https://www.merckmanuals.com/home/eye-disorders/corneal-disorders/superficial-punctate-keratitis

  Superficial punctate keratitis is an eye disorder caused by death of small groups of cells on the surface of the cornea (the clear layer in front of the iris and pupil). […] The cause of superficial punctate keratitis may be any of the following: A viral infection, Blepharitis (eyelid inflammation), Dry eyes, A bacterial infection (including trachoma), Strong chemicals splashed in the eye, Exposure to ultraviolet light (sunlight, sunlamps, or welding arcs), Prolonged use of contact lenses, A side effect of certain medications taken by mouth (orally) or by vein (intravenously), An allergy to eye drops, Bell palsy. […] Treatment depends on the cause.

• #2 Corneal Ulcer: Symptoms, Causes & Treatment

  https://my.clevelandclinic.org/health/diseases/22524-corneal-ulcer

  Parasites. Acanthamoeba family parasites are the most common cause of parasitic infection-related corneal ulcers. These parasites are a major risk for people who swim while wearing contacts. […] Noninfectious causes. These are conditions or circumstances that can cause corneal ulcers without an infection. Examples include: […] Eye injuries. Burns, scratches (corneal abrasions), cuts (lacerations) and punctures can all lead to ulcers when they dont heal correctly. […] Exposure. If you cant close your eyes fully (a condition called lagophthalmos), that leaves your corneas exposed for much longer than they should be. […] Very dry eyes. This can be because of weather conditions, eye conditions or a combination of the two. […] Toxic effects. These can be from toxic substances or, more rarely, from medications youre taking.

• #2 What Causes Keratitis Eye Disease? | What is Keratitis?

  https://www.optegra.com/eye-health-blog/eye-health-care/what-causes-keratitis-eye-disease/

  Keratitis can result from a variety of causes, which fall into two broad categories: infectious and non-infectious. […] Infectious causes include bacteria, viruses (such as herpes simplex), fungi, and parasites like Acanthamoeba. These are often linked to improper contact lens use or exposure to contaminated water. […] Non-infectious causes include eye injuries, glaucoma treatments (particularly those containing preservatives) and Ultraviolet (UV) light exposure (e.g. gazing at a solar eclipse or the use of tanning beds). These factors can trigger corneal inflammation without bacterial, viral, or fungal infection. […] Non-infectious keratitis can result from traumatic eye injuries, contact lens complications, environmental factors (UV exposure, allergens), autoimmune conditions, systemic nutritional deficiencies, eyelid dysfunction, and dry eye syndrome.

• #2 Superficial Punctate Keratitis – Eye Disorders – Merck Manual Professional Edition

  https://www.merckmanuals.com/professional/eye-disorders/corneal-disorders/superficial-punctate-keratitis

  Superficial punctate keratitis is corneal inflammation of diverse causes characterized by scattered, fine, punctate corneal epithelial loss or damage. […] Causes may include any of the following: Viral conjunctivitis (most commonly adenovirus), Blepharitis, Keratoconjunctivitis sicca, Trachoma, Chemical burns, Ultraviolet (UV) light exposure (eg, welding arcs, sunlamps, snow glare), Contact lens overwear, Systemic medications (eg, adenine arabinoside), Topical medication or preservative toxicity, Peripheral facial nerve palsy (including Bell palsy). […] Ultraviolet (UV) B light (wavelength 300 nm) can burn the cornea, causing keratitis or keratoconjunctivitis. Arc welding is a common cause; even a brief, unprotected glance at a welding arc may result in a burn. Other causes include high-voltage electric sparks, artificial sun lamps, and sunlight reflected off snow at high altitudes. […] Diagnosis is by history, presence of superficial punctate keratitis, and absence of a foreign body or infection.

• #2 Pulsenotes | Keratitis

  https://app.pulsenotes.com/specialities/ophthalmology/notes/keratitis

  A variety of infective pathogens can lead to keratitis. Bacterial keratitis can be particularly destructive, and prompt ophthalmic assessment is pertinent to prevent sight loss and minimise scarring. […] Two common causes of viral keratitis include adenovirus and herpes simplex virus (HSV). […] Acanthamoeba refers to the genera of a group of protozoa (single-celled eukaryotes) that can cause human disease. They are ubiquitous in the environment and may lead to keratitis in the developed world due to improper contact lens use. […] Non-infectious causes may be local due to corneal irritation or systemic conditions. […] Autoimmune causes of keratitis (e.g. connective tissue disease, vasculitis) collectively cause peripheral ulcerative keratitis (PUK).

• #2 Interstitial keratitis: MedlinePlus Medical EncyclopediaLock

  https://medlineplus.gov/ency/article/001609.htm

  Interstitial keratitis is a serious condition in which blood vessels grow into the cornea. Such growth can cause loss of the normal clearness of the cornea. This condition is often caused by infections. […] Syphilis is the most common cause of interstitial keratitis, but rare causes include: Autoimmune diseases, like rheumatoid arthritis and sarcoidosis, Leprosy, Lyme disease, Tuberculosis. […] In the United States, most cases of syphilis are recognized and treated before this eye condition develops. […] However, interstitial keratitis accounts for 10% of avoidable blindness in the least developed countries worldwide.

• #2 What is keratitis? | New York Eye & Ear

  https://www.nyee.edu/care/eye/cornea/diseases/infection-inflammation

  Other contributing factors that may impact the severity of the case include the degree of trauma, the presence of underlying ocular surface disease, the use of topical steroids or contact lenses, host immune response, and the time it took to diagnosis and begin treatment. […] The most common risk factors for keratitis include: Contact lenses: Wearing contact lenses increases your risk of both infectious and noninfectious keratitis. […] Impaired or reduce immunity: If your immune system is weakened either from local or systemic disease (i.e., cancer, diabetes, or autoimmune diseases such as lupus or rheumatoid arthritis) or through use of medications (anticancer medications or oral steroids) your risk of developing keratitis is higher. […] Use of topical corticosteroids: The use of corticosteroid eye drops to treat other ocular disease increases your risk of developing keratitis or worsening an existing case. […] Eye injury/ocular trauma: If one of your corneas is injured severely or has been damaged from an injury in the past, you may be more vulnerable to developing keratitis.

• #2 Neurotrophic Keratitis – EyeWiki

  https://eyewiki.org/Neurotrophic_Keratitis

  Every ocular or systemic condition altering corneal sensory innervation which runs from the cornea itself to the pontine trigeminal nucleus can result in NK. […] Most common ocular conditions associated with NK are herpetic keratitis (zoster and simplex), topical anesthetic abuse, chemical and thermal burns, contact lens abuse, topical drug toxicity, irradiation to eye or adnexa, and corneal surgery. […] Chronic use of topical medications containing benzalkonium chloride (BAK) may reduce corneal sensation via nerve damage and impair corneal epithelial healing. […] With regards to corneal procedures, corneal refractive procedures, such as laser in situ keratomileusis (LASIK) and photorefractive keratectomy (PRK), have been linked to NK. […] Non-corneal causes include neurosurgical procedures or trauma damaging the fifth cranial nerve, stroke, aneurysms, multiple sclerosis, intracranial masses (e.g. acoustic neuroma), diabetes (NK has been described as the sole sign of diabetes in a patient), leprosy, vitamin A deficiency, and drugs (narcoleptics and antipsychotics). Congenital hypoplasia of the trigeminal nerve has also been described in association with NK.

• #2 Bacterial Keratitis – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK574509/

  The systemic conditions predisposing to bacterial keratitis are diabetes mellitus, malnourishment, connective tissue or autoimmune pathologies, Steven-Johnson syndrome (SJS), ocular mucous membrane pemphigoid (OMMP), atopic dermatitis, xerophthalmia, blepharoconjunctivitis, 5th and 7th cranial nerve palsy, graft versus host disease, immunosuppression (AIDS) and chronic alcoholism. […] The bacterial species causing keratitis are the following: Gram-positive cocci include Staphylococcus aureus, Staphylococcus epidermidis, and Streptococcus pneumoniae; Gram-positive bacilli include Corynebacterium diphtheriae and Corynebacterium xerosis; Gram-negative bacilli include Pseudomonas aeruginosa, Acinetobacter species; Enterobacteriaceae species include Escherichia coli, Klebsiella, Serratia, and Proteus mirabilis; Gram-negative diplococci, namely Neisseria gonorrhoeae and Neisseria meningitidis; Gram-negative diplobacillus include Moraxella lacunata; Non-tuberculous mycobacterium includes Mycobacterium fortuitum and Mycobacterium chelonae; Gram-negative coccobacillus include Haemophilus influenza and Haemophilus aegyptius; Gram-positive filamentous bacteria include Nocardia asteroids and Nocardia brasiliensis; Coagulase-negative Staphylococcus is one of the most common bacterial species identified recently.

• #2 Dangerous Causes Of Keratitis And Their Impact On Your Eyes

  https://www.cheapmedicineshop.com/blog/eyecare/keratitis-causes/

  Keratitis is a rare eye condition that is caused by the inflammation of the cornea. […] The causes of keratitis are diverse, ranging from infections caused by bacteria, viruses, or fungi to eye injuries. […] Various underlying medical conditions can damage the trigeminal nerve, including Diabetes, Multiple Sclerosis, and facial nerve disorder. […] Prior eye surgeries, particularly those involving the cornea, can also damage the nerve endings responsible for corneal sensitivity. […] Certain viruses, such as herpes simplex, can cause viral infections that can target and damage the corneal nerve. […] Bacterial pink eye or viral pink eye infections can lead to Interstitial Keratitis. […] Syphilis, a sexually transmitted infection, is also a notable cause of this condition. […] Conditions like Rheumatoid Arthritis and Systemic Lupus Erythematosus can cause Interstitial Keratitis.

• #2 Dangerous Causes Of Keratitis And Their Impact On Your Eyes

  https://www.cheapmedicineshop.com/blog/eyecare/keratitis-causes/

  Certain allergic reactions, especially when accompanied by excessive eye rubbing, can lead to the development of Interstitial Keratitis. […] Various microorganisms, including bacteria, fungi, and parasites, often cause Ulcerative Keratitis. […] Bacterial infections such as Bacterial Keratitis and bacterial pink eye are common causes of Ulcerative Keratitis. […] Fungal Keratitis is another source of Ulcerative Keratitis. […] Herpes Simplex Virus (HSV) is a common cause of Keratitis. […] Dry Eye Syndrome can also cause Keratitis due to insufficient tears. […] Conditions such as Rosacea and Atopic Dermatitis can cause inflammation of the eyelids and Conjunctiva. […] Common infectious causes of Keratitis include bacteria, viruses, fungi, and parasites. […] Non-infectious causes of Keratitis include exposure to irritants, such as chemicals, foreign objects, and ultraviolet radiation.

• #2 Infectious keratitis: an update on epidemiology, causative microorganisms, risk factors, and antimicrobial resistance | Eye

  https://www.nature.com/articles/s41433-020-01339-3

  IK can be caused by a wide variety of pathogens including bacteria, fungi, protozoa and viruses. […] Polymicrobial infection has shown to be accountable for ~215% of all IK cases. […] The pathogenesis of CL-related IK is complex and multifactorial. […] In terms of underlying aetiologies, CL-related keratitis is most commonly associated with P. aeruginosa and Acanthamoeba spp., which are both free-living microorganisms that are ubiquitously present in the environment, including water and CL solutions. […] Trauma serves as another common risk factor for IK in both developed and developing countries. […] Fungal keratitis is by far the most common cause (4783%) of trauma-related IK, especially in regions such as Asia and Africa which are dominated by agricultural communities. […] Ocular surface diseases (OSDs), encompassing DEDs, blepharitis, neurotrophic keratopathy, Steven-Johnson syndrome, ocular cicatricial pemphigoid and bullous keratopathy, have been identified as one of the main risk factors for IK in both developed and developing countries.

• #2 Bacterial Keratitis Clinical Presentation: History, Physical, Causes

  https://emedicine.medscape.com/article/1194028-clinical

  Other potential causes include the following: contaminated ocular medications, contact lens solutions, or contact lens cases; decreased immunologic defenses secondary to malnutrition, alcoholism, and diabetes (Moraxella); aqueous tear deficiencies; recent corneal disease (including herpetic keratitis and secondary neurotrophic keratopathy); structural alteration or malposition of the eyelids (including entropion with trichiasis and lagophthalmos); chronic dacryocystitis; use of topical corticosteroids.

• #2 Keratitis: Types, symptoms, and treatment

  https://www.medicalnewstoday.com/articles/320347

  Keratitis develops when something causes inflammation of the cornea. Certain factors make this more likely. […] Wearing contact lenses is the most common risk factor for keratitis. It can cause corneal scratches, dryness, or soreness. This eye damage tends to stem from wearing the lenses for too long, such as while sleeping. A related risk factor is dry eye or reduced volume of tears in the eye. […] Risk factors for viral, bacterial, fungal, or parasitic keratitis include: the use of unclean eye drops or contact solutions, stress reactivating the herpes simplex virus, the flu, shingles, or other viral infections, a health condition that limits the immune system or causes it to be overactive. […] The most common cause is improper use and care of contact lenses. Using dirty contacts or leaving them in overnight can damage the cornea and lead to infection.

• #2 Article | KnE Open

  https://kneopen.com/JOVR/article/view/6729/

  Purpose: To determine the causative organisms and associated risk factors for infectious keratitis in South Texas. […] The most common etiologic agent was bacteria, with 173 bacterial cultures (95.1%) recovered, followed by 13 fungal cultures (7.1%), and 3 Acanthamoeba cultures (1.6%). […] Bacteria are the most common cause of infectious keratitis in this patient population, with coagulase-negative Staphylococcus and Pseudomonas as the most common isolates. […] The prevalence of culture-positive fungal keratitis is significantly lower than that of bacterial keratitis. […] Contact lens wear is the most common risk factor associated with infectious keratitis in South Texas.

• #2 Bacterial and fungal causes of infectious keratitis among patients attending Research Institute of Ophthalmology | Bulletin of the National Research Centre | Full Text

  https://bnrc.springeropen.com/articles/10.1186/s42269-020-00330-y

  Knowing the predisposing factors and etiologic microorganism can help control and prevent this problem. Etiologic and epidemiologic pattern of keratitis varies with the patient population, geographic location and climate. Bacteria and fungi are frequently responsible for suppurative keratitis especially in the developing countries. […] The aim of this study was to detect the predisposing risk factors and the causative agents of infectious keratitis, i.e., bacteria, fungi, and to detect the antimicrobial susceptibility pattern against these causative bacterial and fungal pathogens using antibacterial and antifungal disces, since the bacterial sensitivity to various antimicrobial agents varies from place to place and in the same place from time to time. […] Ocular trauma was the most common predisposing factor observed in 15/50 of the patients.

• #2 Azthena logo with the word Azthena

  https://www.news-medical.net/health/What-is-Keratitis.aspx

  Viral infection with herpes simplex or herpes zoster viruses. […] Polluted water containing microorganisms can cause a damaged cornea to become infected, but rarely affect a healthy one. […] Autoimmune conditions like rheumatoid arthritis. […] Risk factors for keratitis primarily include contact lens-related factors, such as their overuse, failure to keep contact lenses sterile, wearing them while swimming or sleeping, or protracted periods of their usage. Other risk factor are poor immune function, steroid-containing eye drops and, naturally, eye injury.

• #2 Culture-negative Keratitis Causes Less Severe Infection

  https://www.reviewofoptometry.com/article/culturenegative-keratitis-causes-less-severe-infection

  Culture-negative bacterial keratitis had less severe infection and better outcomes when compared with positive cultures. […] The microbiology of bacterial keratitis is not consistent worldwide as it is affected by geographic and economic factors, but it has been shown that the most common causative organisms are similar across the globe with a higher percentage of gram-positive infections. […] Gram-positive bacteria were found to be the causative organism in 106 cases (62.8%) in agreement with previous studies that found these bacteria to be the most frequent cause of microbial keratitis. […] The other factor that may have contributed to the high rates of Pseudomonas is the large percentage of contact lens wearers (24.7%). […] Culture-positive bacterial keratitis was associated with the development of anterior chamber reaction on multivariate analysis. […] Gram-positive bacteria were the most common causative organisms in our sample, the investigators concluded. […] Factors associated with poor outcome in the present study included diabetes, poor presenting visual acuity and positive cultures.

• #2 Keratitis: Types, Pictures, and Treatment

  https://www.healthline.com/health/keratitis

  Keratitis can be caused by an infection or injury to the eye. […] Infectious keratitis is caused by one of the following: […] Bacteria: Pseudomonas aeruginosa and Staphylococcus aureus are the two most common types of bacteria that cause bacterial keratitis. […] Fungi: Fungal keratitis is caused by Aspergillus, Candida, or Fusarium. […] Parasites: An organism called Acanthamoeba has become more common in the United States in those who wear contact lenses. […] Viruses: Viral keratitis is primarily caused by the herpes simplex virus, which progresses from conjunctivitis to keratitis. […] Possible noninfectious causes of keratitis include: eye injury, such as a scratch; wearing your contacts too long; using extended-wear contacts; wearing your contacts while swimming; living in a warm climate, which increases the risk of plant materials damaging your cornea; a weakened immune system; exposure to intense sunlight, called photo keratitis.

• #2 Keratitis: Causes, Symptoms & Treatments

  https://www.truemeds.in/diseases/eye/keratitis-111

  Keratitis is an inflammatory condition of the cornea, the clear dome-shaped window at the front of the eye. It can be caused by various factors, including infections and non-infectious causes, and can lead to corneal blindness if not treated promptly and properly. Treatment for keratitis depends on the cause and severity of the condition. […] Keratitis, also known as corneal inflammation or corneal ulcer, can be caused by a variety of factors. Infectious keratitis is caused by microorganisms such as bacteria, viruses, fungi, or parasites, while noninfectious keratitis can be triggered by injuries, dry eye syndrome, eyelid disorders, or exposure to ultraviolet light. […] Keratitis, an inflammation of the cornea, can be caused by various factors that are classified as infectious or non-infectious. Infectious keratitis is commonly caused by bacteria such as Staphylococcus, Streptococcus, and Pseudomonas, especially in contact lens wearers who do not properly clean and disinfect their lenses or cases. Viral infections like herpes simplex virus, herpes zoster virus, or the common cold can also lead to keratitis if the eye is touched after contact with an infected area. While rare, fungal infections may occur due to contamination from plant material or improper contact lens use. Parasitic infections, typically caused by Acanthamoeba found in water and soil, are more common in contact lens wearers who swim or shower while wearing their lenses.

• #2 What are Keratitis Symptoms and Treatment? – LGO

  https://www.lookingglassoptical.com/keratitis-symptoms-and-treatment/

  Keratitis is divided into two categories based on cause: infectious keratitis and noninfectious keratitis. […] Noninfectious keratitis can be caused by a minor injury, like wearing dirty contact lenses or getting a foreign body in the eye. […] Infectious keratitis can be caused by bacteria, viruses, fungi, and parasites. […] Treatment for keratitis depends on the underlying cause and may include antibiotics, antiviral or antifungal medications, corticosteroid eye drops, pain relief, and in rare cases, surgery. […] If a bacterial infection causes keratitis, your optometrist may prescribe antibiotic eye drops or ointment. […] For a viral keratitis infection, antiviral medicines are prescribed. […] If a fungal infection causes keratitis. […] If the inflammation is severe, your optometrist may prescribe corticosteroid eye drops to reduce inflammation. […] If you experience symptoms of keratitis, as early treatment can prevent complications and help preserve your vision.

• #2 CRSToday | Atypical Keratitis

  https://crstoday.com/articles/2022-aug/atypical-keratitis

  Microbial keratitis is a common sight-threatening ophthalmic emergency that requires prompt diagnosis and judicious antimicrobial treatment to mitigate ocular morbidity. Few clinical features of keratitis are specific enough to reliably diagnose the causative organism on clinical appearance alone. Bacterial keratitis causes most cases of infectious keratitis. Diagnosis, management, and outcomes can be vastly different when atypical organisms are involved. […] Atypical keratitis may be caused by polymicrobial infection, including multiple bacteria or a combination of organisms such as herpetic virus and bacteria. We recommend broad testing for all possible causes and treatment according to clinical suspicion and laboratory results. […] When atypical keratitis is suspected, we recommend restarting the workup. Several features of the patients history may point to a particular etiology, including a history of herpes simplex or zoster virus, immunocompromise, organic trauma (eg, soil, contaminated water sources, agricultural activities, gardening), steroid use, ocular comorbidities, previous ocular surgery, exposure keratopathy, and lid disease.

• #3 Keratitis: Types, Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/24500-keratitis

  Keratitis can have infectious or noninfectious causes. […] Keratitis can be divided into two categories based on cause: infectious keratitis or noninfectious keratitis. Some people call infectious keratitis microbial keratitis. […] There are infectious and noninfectious causes of keratitis. […] Causes of infectious keratitis include: Bacterial keratitis: This type, caused by bacteria, is the most common. Fungal keratitis: This type is caused by fungi, often from plants. Parasitic keratitis: Parasites are organisms that live off another organism. Acanthamoeba keratitis is caused by a one-celled parasite called an amoeba. Viral keratitis: Viruses like the ones that cause shingles and herpes simplex can cause keratitis. Herpes simplex keratitis often recurs. […] Causes of noninfectious keratitis include: Injuring your eye. (This includes having eye surgery, being in an accident and having a condition where your eyelashes scrape against the surface of your eye.) Wearing contact lenses for too long. Having a foreign object in your eye. Being exposed to ultraviolet (UV) light for too long. Having a vitamin A deficiency. Having an eyelid disorder or immune system condition that causes dry eyes.

• #3 What is keratitis? | New York Eye & Ear

  https://www.nyee.edu/care/eye/cornea/diseases/infection-inflammation

  Keratitis is a medical term for inflammation of the cornea. Symptoms include rapid onset of pain and redness of the eye, itching, blurred vision, tearing or discharge from the eye, and sensitivity to light. […] Keratitis resulting from an infection is among the leading causes of preventable blindness worldwide. The disease occurs far more frequently in developing countries, with the total number of cases globally estimated at 500,000 a year. The number of cases in the United States range between 25,000 and 30,000 annually. […] The most common cause of keratitis is injury or infection, but keratitis may also be noninfectious and develop from a wide range of other conditions. […] Corneal infections are caused by a wide variety of microorganisms, including bacteria, viruses, fungi, and protozoa. Bacteria are the most frequent cause of infectious keratitis. The most common groups of bacteria responsible for bacterial keratitis are streptococcus, pseudomonas, enterobacteriaceae (including klebsiella, enterobacter, serratia, and proteus), and staphylococcusspecies.

• #3 What Causes Keratitis Eye Disease? | What is Keratitis?

  https://www.optegra.com/eye-health-blog/eye-health-care/what-causes-keratitis-eye-disease/

  Extended or overnight wear of contact lenses may lead to Keratitis. This happens because the cornea is deprived of oxygen, weakening its defences and being prone to contamination and infection. […] Wearing contact lenses while swimming, such as in pools, hot tubs, or natural bodies of water, can lead to harmful microorganisms clinging to contact lenses causing contamination of the cornea. This keratitis (bacterial or acanthamoeba keratitis) is very dangerous and can lead to blindness.

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