spontaneous loss of a part of the surface "skin" of the eye-causes pain, light sensitivity and occasionally blurriness, and often occurs on awakening
a spontaneous breakdown of the epithelium, sometimes at the site of an earlier abrasion
mostly very painful graze of the corneal surface accompanied by an intense foreign-body feeling; as a rule, it is healed up in a few days' time.
A sloughing off of the front layer of skin (epithelium) of the eye. This can be caused by injury or hereditary conditions, and usually leaves the eye feeling 'scratchy' or painful. The epithelium re-generates over the course of a couple days and the symptoms go away.
Recurrent breakdown of the corneal epithelium, typically caused by a previous corneal abrasion or by map-dot-fingerprint dystrophy. Symptoms include blurred vision, foreign body sensation and eye pain or discomfort.