Corneal ulcer

**Definition:** Loss of epithelial tissue from the surface of the cornea due to progressive erosion and necrosis of the tissue. It is often caused by bacterial, fungal, or viral infection.

**Inclusions:** - Central corneal ulcer - Ring corneal ulcer - Corneal ulcer with hypopyon - Marginal corneal ulcer - Mooren's corneal ulcer - Perforated corneal ulcer