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Keratitis is inflammation of the cornea, the clear dome at the front of the eye. It can be infectious, caused by bacteria, viruses, fungi, or parasites, or noninfectious, caused by dry eye, contact lens overuse, allergies, injuries, or exposure from incomplete eyelid closure.
read more about keratitis ...Duration depends on the cause and how quickly treatment starts. Bacterial keratitis often improves within days of starting appropriate antibiotic drops and typically heals within one to three weeks. Viral keratitis may resolve in weeks but can recur, especially with herpes simplex. Fungal and Acanthamoeba infections often require extended treatment and may take months to clear.
Noninfectious keratitis from dryness, exposure, or contact lens irritation can improve within days to weeks with lubrication and surface protection, though stubborn defects or nerve damage heal more slowly. Delays in treatment extend recovery time and increase the risk of scarring.
Infectious causes include bacteria from contact lens misuse or eye trauma, herpes simplex or zoster viruses, fungi after plant matter injuries, and Acanthamoeba from water exposure in contact lenses. Poor lens hygiene, sleeping in lenses, and rinsing lenses with tap water are common risk factors.
Noninfectious causes include dry eye disease, allergic or toxic reactions to medications or eye drop preservatives, ultraviolet exposure, incomplete eyelid closure, and reduced corneal sensation from diabetes or prior infection. Any break in the corneal surface can open the door to secondary infection.
Typical symptoms include eye pain, redness, foreign body sensation, light sensitivity, tearing, and blurry vision. Mucous or purulent discharge suggests infection. Contact lens wearers may notice rapid onset after overnight wear or water exposure.
In neurotrophic keratitis, corneal sensation is reduced, so symptoms can be surprisingly mild despite significant damage. Advanced cases may show a white spot, corneal haze, or swelling with more persistent vision loss.
Keratitis can progress quickly, and infectious ulcers can threaten the clarity and strength of the cornea. Contact lens misuse and eye trauma add risk, and herpetic or neurotrophic disease may recur. Recognizing pain, light sensitivity, and a red, blurred eye and seeking prompt care helps prevent scarring and perforation.
The outlook is good when treatment begins early and is guided by culture or exam findings. Along with targeted antibiotics or antivirals, simple steps like stopping contact lens wear temporarily, improving lens hygiene, using lubrication, protecting the eye surface during sleep, and managing dry eye or eyelid conditions reduce recurrence. Severe cases benefit from referral to a cornea specialist and structured follow-up care.
Diagnosis starts with slit lamp examination and fluorescein staining to identify defects and ulcers. When infection is suspected, doctors may perform corneal scrapings for microscopic examination and cultures. Testing corneal sensation, reviewing contact lens habits, and imaging with anterior segment OCT help guide care and monitor thinning or swelling.
Treatment targets the underlying cause. Bacterial keratitis is managed with topical antibiotics, often administered frequently at first. Herpetic disease uses antiviral therapy, while fungal and Acanthamoeba infections require specialized medications and extended treatment. Noninfectious cases respond to lubrication, anti-inflammatory therapy, eyelid protection, or moisture chambers. Severe thinning or perforation may require tissue glue, amniotic membrane grafts, or corneal transplant. Follow-up care is important to adjust therapy and prevent complications.
Most treated cases heal without permanent blindness, but severe or delayed infections can scar, perforate, or require transplant, which can cause lasting vision loss. Early treatment lowers this risk significantly.
Yes, many cases resolve with the right treatment. Bacterial keratitis often clears with antibiotics, herpetic disease is controlled with antivirals, and noninfectious causes improve with surface care. Some infections, like Acanthamoeba or fungal keratitis, require months of treatment and close monitoring.
It can develop quickly after a contact lens-related injury or abrasion, sometimes within hours to a day. Acanthamoeba and fungal infections may develop more slowly over days to weeks after water or plant exposure.
References
Mayo Clinic. Keratitis: Symptoms and causes. https://www.mayoclinic.org/diseases-conditions/keratitis/symptoms-causes/syc-20374110
Mayo Clinic. Keratitis: Diagnosis and treatment. https://www.mayoclinic.org/diseases-conditions/keratitis/diagnosis-treatment/drc-20374114
American Academy of Ophthalmology. What Is a Corneal Ulcer. https://www.aao.org/eye-health/diseases/corneal-ulcer
AAO Ophthalmology. Bacterial Keratitis Preferred Practice Pattern. https://www.aaojournal.org/article/S0161-6420(18)32644-7/fulltext
National Eye Institute. Corneal conditions overview. https://www.nei.nih.gov/learn-about-eye-health/eye-conditions-and-diseases/corneal-conditions
Cleveland Clinic. Keratitis: Types, Symptoms and Treatment. https://my.clevelandclinic.org/health/diseases/24500-keratitis
StatPearls. Corneal Ulcer. https://www.ncbi.nlm.nih.gov/books/NBK539689/
Cleveland Clinic. Acanthamoeba Keratitis. https://my.clevelandclinic.org/health/diseases/21560-acanthamoeba-keratitis