Corneal Ulcer: Warning Signs, Treatment, and When to Seek Urgent Care

Most people with a corneal ulcer feel significant pain in the affected eye. The sensation may be sharp, burning, or feel like something is stuck that will not come out.

The discomfort often worsens with blinking or light exposure. It typically does not go away on its own and tends to intensify over time rather than improve.

A corneal ulcer can make your vision blurry or hazy as the infection clouds the normally clear cornea. You may struggle to read, drive, or see detail clearly.

The amount of vision loss depends on the size of the ulcer and where it sits on the cornea. Ulcers located in the center tend to affect vision more than those near the outer edge.

Your eye will likely appear red or bloodshot as blood vessels in the white of the eye become swollen and more visible. Excess tearing is also common as the eye tries to flush out the irritant.

• Bright redness around the cornea or across the entire eye
• Constant watering or tearing
• Strong sensitivity to normal indoor or outdoor light
• Squinting or difficulty keeping the eye open in lit spaces

Many corneal ulcers appear as a white, gray, or cloudy spot on the surface of the eye. You may be able to see it when looking closely in a mirror, though some are quite small.

This spot marks the area of damaged, infected tissue. It is one of the key signs we look for during your exam and a strong signal that same-day care is needed.

Infected eyes frequently produce discharge or pus. You may wake up with eyelids stuck together from dried drainage. The discharge may be yellow, green, white, or clear depending on the organism causing the infection.

Thick or colored discharge strongly suggests bacterial involvement. Even clear discharge, when paired with pain or redness, warrants immediate medical attention.

Certain symptoms signal that you need emergency eye care without delay. Do not wait overnight or attempt to treat these signs at home.

• Sudden or rapidly worsening vision in one or both eyes
• Severe eye pain not relieved by over-the-counter pain medicine
• A visible white or cloudy spot on your cornea
• Any eye symptoms following an injury or contact lens use
• Eye pain accompanied by fever or general illness

While arranging care, take these precautions to protect your eye.

• Remove contact lenses immediately and bring your lenses and case to your appointment if asked
• Do not patch or cover the affected eye
• Do not use leftover prescription drops, especially steroid-containing ones, without direct instruction from an eye care provider
• Avoid driving if your vision is significantly reduced
• Go to an emergency eye clinic or urgent care facility if same-day eye care is unavailable

Most corneal ulcers are treated with antibiotic, antifungal, or antiviral eye drops depending on the cause. Antibiotic drops are usually the first step when bacteria are suspected, and they may need to be applied very frequently at first, sometimes every 30 minutes to one hour during waking hours.

Fungal ulcers are less common but often more difficult to treat. Treatment with antifungal drops may continue for several weeks or months. Steroid eye drops should never be used unless specifically directed by your eye care provider, as they can worsen many types of corneal infections.

Some infections benefit from oral medications used alongside eye drops. Systemic therapy is used for specific causes such as herpes simplex, herpes zoster, gonorrhea, or chlamydia, and in selected severe cases where additional support is appropriate.

It is important to complete the full course of any oral medication even if your eye begins to feel better. Stopping early can allow the infection to return and become harder to treat.

Corneal ulcers can be very painful, and managing discomfort is an important part of recovery. Over-the-counter pain relievers such as acetaminophen or ibuprofen often help, and we may prescribe stronger options if needed.

We may also prescribe cycloplegic eye drops, which relax the muscles inside the eye to reduce pain and light sensitivity. Topical numbing drops should never be used at home on your own, as repeated use can slow healing and cause serious damage to the cornea.

• Cool compresses applied gently over the closed eye for comfort
• Lubricating eye drops to ease dryness and surface irritation
• Dark sunglasses to reduce sensitivity to light
• Rest and reduced screen time if it causes strain

Ulcers that do not respond to medication or that cause structural damage to the cornea may require surgical intervention. A corneal transplant, which replaces damaged tissue with healthy donor tissue, can preserve vision when other treatments have not been sufficient.

Other procedures include amniotic membrane grafts to support healing or techniques to seal small perforations. If surgery becomes necessary, we will explain all available options and guide you through the decision-making process.

The most serious ulcers may require inpatient hospital treatment. Admission may be needed when the infection is spreading rapidly, when a patient cannot reliably administer frequent drops at home, when close monitoring is required, or when an underlying health condition makes outpatient care unsafe.

Hospital treatment typically involves intensive around-the-clock eye drop therapy. Intravenous medications are used only in specific situations, such as when the infection may be spreading beyond the cornea. Most hospital stays last a few days to a week, after which treatment continues at home with regular follow-up visits.