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Keratitis Ulcer

What is Keratitis ulcer?

Keratitis ulcer, more precisely called a corneal ulcer, is an open sore on the transparent front surface of the eye (the cornea) that results from inflammation (keratitis) and subsequent tissue loss. The cornea provides most of the eye’s focusing power, so any defect can cause pain, blurry vision, and if untreated, permanent scarring or vision loss. The condition typically develops after an infection, trauma, or an underlying ocular surface disease, and it is considered an ocular emergency because the cornea has limited ability to repair itself without scarring.

Sources: Mayo Clinic, CDC.

Common Causes

The following conditions are the most frequent precipitating factors for a corneal (keratitis) ulcer:

• Bacterial infection – especially Pseudomonas aeruginosa in contact‑lens wearers.
• Fungal infection – common after trauma with vegetative material (e.g., agricultural work).
• Acanthamoeba infection – linked to poor hygiene of soft contact lenses.
• Viral keratitis – primarily due to herpes simplex virus (HSV) or varicella‑zoster virus.
• Contact lens misuse – overnight wear, water exposure, and inadequate cleaning.
• Eye trauma – scratches, foreign bodies, or chemical burns that breach the corneal epithelium.
• Dry eye disease & ocular surface disorders – Sjögren’s syndrome, ocular rosacea, or exposure keratopathy.
• Immune‑mediated conditions – rheumatoid arthritis, Stevens‑Johnson syndrome.
• Neurotrophic keratopathy – reduced corneal sensation (e.g., after trigeminal nerve injury).
• Post‑surgical complications – after cataract extraction, refractive surgery, or LASIK.

Associated Symptoms

Patients with a corneal ulcer often experience a cluster of ocular complaints:

• Severe, gritty or burning eye pain.
• Marked redness (hyperemia) of the sclera and conjunctiva.
• Blurred or decreased vision, sometimes described as “halo” vision.
• Tearing (epiphora) and/or discharge that may be purulent.
• Photophobia – increased sensitivity to light.
• Feeling of something “stuck” in the eye.
• Visible white or yellowish infiltrate on the cornea when examined with a slit lamp.

When to See a Doctor

Because corneal ulcers can rapidly progress to permanent damage, prompt evaluation is critical. Seek professional care if you notice:

• New or worsening eye pain that does not improve with artificial tears.
• Redness combined with visual changes (blurred vision, double vision, loss of vision).
• Discharge that is thick, yellow, green, or foul‑smelling.
• History of recent contact‑lens wear, eye injury, or exposure to contaminated water.
• Any symptom persisting longer than 24‑48 hours despite home care.

Diagnosis

A thorough ophthalmic work‑up is required to confirm a corneal ulcer and to determine its etiology.

1. Clinical examination

• Visual acuity test – baseline measurement of vision loss.
• Slit‑lamp biomicroscopy – magnified view to assess ulcer size, depth, location, and presence of infiltrates.
• Fluorescein staining – a drop of fluorescein dye highlights epithelial defects; the ulcer appears as a bright green area.
• Seidel test – checks for leaking aqueous humor in cases of perforation.

2. Laboratory investigations

• Corneal scrapings – taken with a sterile blade and examined under Gram stain, Giemsa, or calco‑fluor for bacteria, fungi, and Acanthamoeba.
• Cultures – grown on blood agar, chocolate agar, Sabouraud agar, or non‑nutrient agar with E. coli overlay.
• Polymerase chain reaction (PCR) – for viral DNA (HSV, VZV) when a viral cause is suspected.
• Confocal microscopy – non‑invasive imaging useful for detecting Acanthamoeba cysts and fungal hyphae.

3. Ancillary tests (selected cases)

• Dry‑eye work‑up (Schirmer test, tear film break‑up time).
• Autoimmune screening (ANA, rheumatoid factor) if an immune-mediated keratitis is suspected.

Treatment Options

Treatment is guided by the ulcer’s cause, size, depth, and risk of perforation.

1. Medical therapy

• Topical antibiotics – first‑line for bacterial ulcers (e.g., fortified cefazolin 5% and tobramycin 1%).
• Broad‑spectrum fortified drops – used initially until culture results guide targeted therapy.
• Antifungal agents – natamycin 5% (FDA‑approved for filamentous fungi) or voriconazole eye drops for fungal ulcers.
• Anti‑Acanthamoeba therapy – polyhexamethylene biguanide (PHMB) 0.02% or chlorhexidine 0.02% combined with propamidine.
• Antiviral drops – topical trifluridine 1% or oral acyclovir/valacyclovir for HSV keratitis.
• Corticosteroids – may be added after epithelial healing begins in non‑infectious or certain bacterial ulcers to reduce scarring; never start before infection is controlled.
• Pain control – preservative‑free lubricating drops, oral NSAIDs or acetaminophen; in severe pain, cycloplegic drops (e.g., homatropine 2%) can relieve ciliary spasm.

2. Surgical interventions

• Debridement – mechanical removal of necrotic tissue to improve drug penetration.
• Corneal cross‑linking (CXL) – UV‑A light with riboflavin; increasingly used for small, early fungal or bacterial ulcers.
• Amniotic membrane transplantation – promotes healing and reduces inflammation.
• Lamellar or penetrating keratoplasty – graft surgery for large, deep, or perforated ulcers.

3. Home care & adjuncts

• Strict hand hygiene and avoidance of touching the eye.
• Use of preservative‑free artificial tears every 2‑4 hours to keep the ocular surface moist.
• Protective eye patch at night only if recommended by the ophthalmologist.
• Discontinue contact‑lens wear until cleared by a clinician; discard the current lens case and solution.

Prevention Tips

Many corneal ulcers are preventable with good ocular hygiene and early management of risk factors.

• Proper contact‑lens care – wash hands before handling lenses, use recommended disinfecting solution, replace lenses and cases as directed, and avoid water exposure (swimming, showering).
• Protect eyes from trauma – wear safety goggles during sports, woodworking, or gardening.
• Maintain ocular surface health – treat dry‑eye disease with lubricants, punctal plugs, or prescription therapy.
• Prompt treatment of eye infections – see a clinician early for conjunctivitis, blepharitis, or any red eye.
• Regular eye examinations – especially for patients with diabetes, autoimmune disease, or a history of ocular surgery.
• Avoid rubbing eyes – mechanical irritation can breach the epithelium.
• Use protective eyewear when handling chemicals or hot substances.

Emergency Warning Signs

Key Take‑aways

A corneal (keratitis) ulcer is a sight‑threatening condition that arises from infection, trauma, or underlying surface disease. Early recognition, timely laboratory work‑up, and targeted antimicrobial therapy are essential to preserve vision. While most ulcers can be managed medically, deeper or refractory cases may need surgical intervention. Practicing good contact‑lens hygiene, protecting the eyes from injury, and maintaining overall ocular health are the most effective strategies to prevent this painful condition.

For further reading, consult reputable sources such as the CDC, Mayo Clinic, and the National Institutes of Health (NIH).

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