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A corneal ulcer is an open sore on the cornea that can result from infection, injury, or dry eye. Learn how to prevent, diagnose, and treat corneal ulcers from the American Academy of Ophthalmology. What is a corneal ulcer ? Read on to learn more about this eye condition, including its symptoms, causes, and treatment options. A corneal ulcer is an open sore on your cornea that can be caused by a virus or bacterial infection. Learn more about the causes, risk factors, symptoms, diagnosis, treatment, prevention, and ... What is a corneal ulcer ? A corneal ulcer is a wound-like sore on your cornea, the clear, dome-shaped tissue layer at the front of your eye. Corneal ulcers can happen for several reasons, but they usually happen because of infections.