Epithelium, Corneal

Epithelium is a type of tissue made up of tightly-packed cells that form a protective layer over the surface of the body. The corneal epithelium, which is located on the surface of the eye, is especially important for its role in vision. It provides a barrier against bacteria, dust, and other foreign particles, and functions as a lubricant to keep the eye moist. Its outermost layer is made up of highly specialized cells that contain proteins that help refract light, allowing vision. Corneal epithelial injuries are a common source of vision problems and can result in corneal abrasions, ulcers, and scarring. Treatment typically involves protecting the eye while the epithelium heals, which can be done with antibiotic eye drops, specialized contact lenses, or, in more severe cases, corneal tissue transplantation.