Corneal ulcer: A corneal ulcer is an open sore

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. Defined as a defect in the corneal epithelium with underlying inflammation, a corneal ulcer , or keratitis, can have a profound impact on vision if not swiftly and adequately addressed. While corneal ulcers may arise from various etiologies, the majority are infectious in origin. 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. A corneal ulcer is a corneal epithelial defect with underlying inflammation usually due to invasion by bacteria, fungi, viruses, or Acanthamoeba (See also Introduction to Corneal Disorders.) Etiology of Corneal Ulcer Corneal ulcers have many causes (see table Causes of Corneal Ulcers ). Herpes simplex keratitis is discussed separately.