. Corneal dystrophies are characterized by the accumulation of foreign material in one or more of the five layers of the cornea. Such material may cause the cornea to lose its transparency potentially causing loss of vision or blurred vision. A symptom common to many forms of corneal dystrophy is recurrent corneal erosion, in which the outermost layer of the cornea (epithelium) does not stick (adhere) to the eye properly. Recurrent corneal erosion can cause discomfort or severe pain, an abnormal sensitivity to light (photophobia