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What Is a Corneal Ulcer (Eye Surface Wound)? Signs and Causes

Prof. Dr. Murat ŞaroğluUpdated on June 2, 2026

A corneal ulcer is a serious eye problem that develops as a result of injury or damage to the transparent front surface of the eye. It is especially common following trauma and, because it can progress rapidly, early diagnosis is critically important. Below you will find its signs and causes.

What is a corneal ulcer?

The cornea is the transparent front surface of the eye. Injury or tissue damage to this surface is called a corneal ulcer. It is a rapidly progressing eye problem that must be taken seriously.

What are the signs?

  • Tendency to keep the eye closed
  • Heavy tearing
  • Sensitivity to light
  • Feeling of discomfort in the eye

Causes and the importance of early diagnosis

Corneal ulcers are especially common following trauma and can progress rapidly. Because they can advance to vision loss if untreated, early diagnosis and evaluation by a veterinarian or ophthalmologist are important. If you notice eye pain or constant eye closure, seek medical attention without delay.

This article is for informational purposes only and does not replace a veterinary examination. If you have any concern about your companion’s eyes, please consult a veterinary ophthalmologist.

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