What Causes Corneal Erosions And How Are They Treated?

A corneal erosion happens when the eye’s outermost layer, the epithelium, scrapes off or separates from the tissue beneath it. This usually occurs after a minor injury, such as a fingernail or a tree branch scratching the eye. The result is intense pain, sensitivity to light, and the feeling that something is permanently stuck in your eye. Most erosions heal within a few days with proper care, but some people develop a recurring condition that requires ongoing management.

What Causes Corneal Erosions And How Are They Treated?

A corneal erosion starts with damage to the epithelial cells that cover the cornea. The cornea is the clear dome at the front of your eye. It has five layers, and the epithelium is the outermost one. This layer acts as a barrier and is packed with nerve endings, which is why erosion hurts so much.

The most common cause is a direct injury. A scratch from a fingernail, a makeup brush, a tree branch, or even a piece of dust can tear the epithelium. This is called a traumatic corneal erosion. The injury may seem minor at first, but the pain can be severe and sudden, often waking people from sleep.

The second major cause is an underlying condition called map-dot-fingerprint dystrophy, also known as epithelial basement membrane dystrophy. In this condition, the basement membrane—the layer that anchors the epithelium to the cornea—is weak or abnormal. The epithelium does not stick down properly. Even without any injury, the layer can peel away, often during sleep when the eyelid moves across the eye.

Some research suggests that people who have had multiple erosions may have a genetic tendency toward weaker corneal adhesion, but this is not fully understood. Dry eye syndrome can also contribute, because a dry surface makes the epithelium more fragile and more likely to tear.

What Does a Corneal Erosion Feel Like?

The pain from a corneal erosion is often described as intense and sharp. It feels like a foreign object is embedded in the eye, even when nothing is there. Many people report that the pain is worse on waking, particularly if the eyelid has stuck to the eroded area during sleep.

Other symptoms include redness, tearing, and blurred vision. The eye may water excessively as a protective response. Sensitivity to light, called photophobia, is common. Some people also experience a gritty sensation that does not go away with blinking.

Symptoms can come and go. A person might feel fine during the day, then wake up in the middle of the night with severe pain. This pattern is typical of recurrent corneal erosion, where the epithelium repeatedly fails to stay attached.

How Is a Corneal Erosion Diagnosed?

An eye doctor diagnoses a corneal erosion with a slit lamp examination. This is a specialized microscope that lets the doctor see the layers of the eye in detail. The doctor may place a drop of fluorescein dye into the eye. This orange dye glows green under a blue light and highlights areas where the epithelium is missing.

In some cases, the erosion has already healed by the time you see the doctor. The doctor may still identify the cause, such as map-dot-fingerprint dystrophy, by looking for subtle changes in the corneal surface. A history of waking with eye pain is often enough to suggest the diagnosis even if no erosion is visible at the time of the exam.

What Are the Treatment Options for a First-Time Erosion?

For a first-time corneal erosion, treatment focuses on protecting the eye while the epithelium heals. The eye doctor may prescribe antibiotic eye drops or ointment to prevent infection. These are used for a short period, usually about a week.

Lubricating drops and ointments are the mainstay of treatment. Preservative-free artificial tears can be used frequently during the day. A thicker ointment is often recommended at bedtime. This keeps the eye lubricated through the night and helps prevent the eyelid from sticking to the healing surface.

In some cases, the doctor may place a bandage contact lens. This is a soft lens that covers the cornea and reduces pain while the epithelium reattaches. The lens is worn continuously for several days and removed by the doctor. Not everyone needs this, but it can be helpful for larger erosions or for people in significant pain.

Oral pain relievers may be recommended for the first few days. The eye itself can be patched in some situations, though this is less common now because patching can slow healing and increase the risk of infection.

What Treatments Are Used for Recurrent Corneal Erosions?

Recurrent corneal erosion is treated differently from a first-time injury. The goal shifts from simple healing to preventing future episodes. This requires strengthening the adhesion between the epithelium and the layers beneath it.

Long-term lubrication is the first step. Consistent use of artificial tears during the day and a lubricating ointment at night reduces friction and keeps the surface healthy. Some doctors recommend a hypertonic saline ointment at bedtime. This draws fluid out of the cornea and may improve adhesion. Evidence for its effectiveness is mixed, but it is widely used in clinical practice.

If lubrication alone does not control the problem, office-based procedures may help. Anterior stromal puncture is one option. The doctor uses a fine needle to create tiny punctures in the cornea. This stimulates scar tissue formation, which anchors the epithelium more firmly. This procedure is effective for many people, though it can cause some scarring and is not suitable for erosions in the center of the cornea.

Phototherapeutic keratectomy, or PTK, is another option. This uses an excimer laser to remove a thin layer of the cornea’s surface. The new epithelium that grows back adheres more strongly. PTK has a high success rate, with most studies reporting significant improvement in symptoms. Some research suggests it may be more effective than anterior stromal puncture for certain types of erosions.

A newer approach is alcohol delamination, where a diluted alcohol solution is applied to loosen the epithelium so it can be removed and allowed to regrow. This is less commonly performed but is a recognized option in some clinics.

What Can You Do to Prevent Future Erosions?

Prevention focuses on reducing friction and keeping the eye surface healthy. Using a lubricating ointment at night is the single most important step for people with recurrent erosions. It keeps the eyelid from sticking to the cornea during sleep, which is the most common trigger for waking episodes.

Avoid rubbing your eyes. Rubbing can lift the epithelium and trigger an erosion, especially if the underlying adhesion is weak. If you feel a foreign body sensation, use artificial tears rather than rubbing.

Wear protective eyewear during activities that could injure the eye. This includes yard work, home repairs, and contact sports. Many recurrent erosions begin with a single traumatic event, so preventing that first injury matters.

Keep your eyes well lubricated in dry environments. Air conditioning, airplane cabins, and heated rooms can dry the eye surface. Using preservative-free drops before and during exposure can help.

When Should You See a Doctor?

Any sudden eye pain, especially with tearing or light sensitivity, warrants an eye exam. A corneal erosion can look like other conditions, including a corneal ulcer or infection, which require different treatment. Only a doctor can make that distinction.

See a doctor promptly if you have pain that does not improve with lubricating drops, if your vision changes, or if you have a history of recurrent erosions that is getting worse. If you have had more than one episode, ask about long-term management options rather than treating each episode as a new injury.

Do not attempt to remove anything from your eye yourself. Do not use tweezers, cotton swabs, or any other object. Flush the eye with sterile saline or artificial tears and seek professional care.