Keratoconjunctival Ulcer - Causes, Treatment & When to See a Doctor

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What is Keratoconjunctival Ulcer?

A keratoconjunctival ulcer is an open sore that involves both the cornea (the clear front surface of the eye) and the adjacent conjunctiva (the thin, transparent membrane that lines the eyelids and covers the white part of the eye). The ulcer represents a loss of the normal epithelial cell layer, exposing underlying stromal tissue to infection, inflammation, and scarring. Because the cornea is responsible for focusing light, any defect can compromise vision and, if left untreated, may lead to permanent visual loss.

The condition is most often the result of an infectious process, but non‑infectious inflammatory or traumatic causes can also produce a similar ulcerative lesion. Prompt recognition and treatment are essential to prevent complications such as corneal perforation, microbial keratitis, or irreversible scarring.

Common Causes

Several distinct conditions can give rise to a keratoconjunctival ulcer. The most frequent are listed below:

• Bacterial keratitis – Common pathogens include Staphylococcus aureus, Pseudomonas aeruginosa, and Streptococcus pneumoniae (Mayo Clinic, 2023).
• Fungal keratitis – Often caused by Fusarium or Aspergillus species, especially after ocular trauma with plant material (CDC, 2022).
• Acanthamoeba keratitis – A rare but severe infection linked to contaminated contact‑lens solutions (NIH, 2021).
• Herpes simplex virus (HSV) keratitis – Viral replication in the corneal epithelium can produce a dendritic ulcer that may progress to a stromal ulcer.
• Varicella‑zoster virus (VZV) keratitis – Typically follows shingles involving the ophthalmic branch of the trigeminal nerve.
• Contact‑lens‑induced ulcer – Over‑wear, poor hygiene, or hypoxia from low‑oxygen lenses can predispose to microbial infection.
• Traumatic abrasion or foreign body – Mechanical injury disrupts the epithelium, providing a portal for organisms.
• Autoimmune/ inflammatory disorders – Conditions such as rheumatoid arthritis, Stevens‑Johnson syndrome, or ocular cicatricial pemphigoid may cause sterile ulceration.
• Exposure keratitis – Inadequate eyelid closure (e.g., facial nerve palsy) leads to drying and ulcer formation.
• Chemical burns – Acidic or alkaline injuries damage both corneal and conjunctival tissues, often resulting in ulceration.

Associated Symptoms

Patients with a keratoconjunctival ulcer usually experience a combination of the following:

• Severe eye pain or burning sensation.
• Redness that involves both the sclera and the conjunctiva.
• Excessive tearing or a watery discharge.
• Purulent (pus‑filled) or mucopurulent discharge, especially with bacterial infection.
• Photophobia – heightened sensitivity to light.
• Blurred or decreased vision, which may fluctuate.
• Foreign‑body sensation despite the absence of any object.
• Swelling of the eyelids (palpebral edema).
• Visible ulcer or ulceration on slit‑lamp examination – a crater‑like defect with a white or yellow base and surrounding inflammatory infiltrate.

When to See a Doctor

Any of the following situations should prompt an immediate ophthalmology appointment:

• Onset of moderate to severe eye pain that does not improve within a few hours.
• Rapid worsening of redness, swelling, or discharge.
• Sudden decrease in visual acuity or new double vision.
• Presence of a white or gray spot on the cornea that you can see without an exam.
• History of recent eye trauma, chemical exposure, or contact‑lens wear combined with any of the symptoms above.
• Systemic signs of infection such as fever, chills, or malaise.

Early evaluation can prevent permanent damage and preserve sight.

Diagnosis

Diagnosing a keratoconjunctival ulcer involves a systematic approach:

1. Clinical History

The clinician will ask about onset, duration, contact‑lens use, recent injuries, systemic illnesses, and any prior eye problems.

2. Visual Acuity Testing

Standard eye‑charts (Snellen or LogMAR) determine the extent to which vision is affected.

3. Slit‑Lamp Biomicroscopy

This magnified examination is the cornerstone. It reveals the ulcer’s size, depth, location, presence of infiltrates, and any hypopyon (pus in the anterior chamber).

4. Staining Techniques

• Fluorescein dye – Highlights epithelial defects; the ulcer appears as a bright green area.
• Lissamine green or rose bengal – Helps assess conjunctival involvement.

5. Microbiological Sampling

If infection is suspected, the physician may obtain corneal scrapings for Gram stain, potassium hydroxide (KOH) wet mount, and culture on bacterial, fungal, and Acanthamoeba media. Polymerase chain reaction (PCR) testing can identify viral DNA (e.g., HSV, VZV).

6. Ancillary Tests

• Anterior segment OCT – Provides cross‑sectional images of ulcer depth.
• Confocal microscopy – Useful for detecting Acanthamoeba cysts.
• Blood work – When an autoimmune cause is considered, ESR, CRP, rheumatoid factor, or ANA may be ordered.

Treatment Options

Therapy is tailored to the underlying cause, ulcer size, and severity. Management generally includes both medical and supportive measures.

Medical Treatments

• Antibiotic eye drops – Broad‑spectrum agents (e.g., moxifloxacin, ciprofloxacin) are used initially for bacterial ulcers. Once cultures return, therapy is narrowed.
• Antifungal eye drops – Natamycin 5% is first‑line for filamentous fungi; voriconazole may be used for resistant cases.
• Antiviral therapy – Topical trifluridine or ganciclovir for HSV; oral acyclovir or valacyclovir for systemic control.
• Acanthamoeba agents – Combination of polyhexamethylene biguanide (PHMB) 0.02% and chlorhexidine 0.02%, applied hourly initially.
• Corticosteroids – Reserved for severe inflammatory response after antimicrobial coverage is established; high‑potency steroids (e.g., prednisolone acetate 1%) are tapered over weeks.
• Cycloplegic drops – Atropine or cyclopentolate reduce painful ciliary spasm.
• Systemic therapy – Oral antibiotics (e.g., doxycycline) may be added for severe bacterial ulcer or to inhibit collagenase activity.

Procedural / Surgical Interventions

• Debridement – Mechanical removal of necrotic tissue can improve drug penetration.
• Therapeutic keratoplasty – Partial (lamellar) or full‑thickness corneal transplant for deep or non‑healing ulcers.
• Amniotic membrane graft – Promotes epithelial healing and reduces inflammation.
• Collagen cross‑linking (CXL) – In selected cases of infectious keratitis, CXL can halt stromal melt.

Home / Supportive Care

• Artificial tears (preservative‑free) to keep the ocular surface moist.
• Cold compresses for pain relief (avoid direct pressure on the globe).
• Strict hand hygiene and avoidance of touching the eye.
• Discontinue contact‑lens wear until cleared by an eye‑care professional.
• Protect the eye with a lubricating ointment and patch at night if advised.

Prevention Tips

Many keratoconjunctival ulcers are preventable with simple lifestyle and hygiene measures:

• Proper contact‑lens care – Use recommended cleaning solutions, replace lenses on schedule, and never sleep in lenses not approved for overnight wear.
• Hand hygiene – Wash hands with soap before handling lenses or touching the eye.
• Protective eyewear – Wear goggles during gardening, woodworking, or sports to avoid trauma and exposure to plant material.
• Avoid eye rubbing – Especially if you have allergies or dry eye, as it can disrupt the epithelium.
• Manage systemic conditions – Good control of diabetes, autoimmune disease, or immunosuppression reduces infection risk.
• Promptly treat ocular surface disorders – Dry eye, blepharitis, and meibomian gland dysfunction should be managed to maintain a healthy tear film.
• Stay up to date with vaccinations – Shingles vaccine (RZV) lowers the risk of VZV ocular involvement.

Emergency Warning Signs

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**References**

• Mayo Clinic. “Keratitis.” 2023. https://www.mayoclinic.org
• Centers for Disease Control and Prevention. “Fungal Eye Infections.” 2022. https://www.cdc.gov
• National Institutes of Health, National Eye Institute. “Acanthamoeba Keratitis.” 2021. https://www.nei.nih.gov
• Cleveland Clinic. “Herpes Simplex Keratitis.” 2023. https://my.clevelandclinic.org
• World Health Organization. “Shingles (Herpes Zoster) Vaccines.” 2022. https://www.who.int
• Ocular Surface Disease Index (OSDI) guidelines – 2020.

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