It has long been known that the epithelium of the cornea would regenerate itself after being destroyed intentionally or by accident.
Haller1 as early as 1763, in his "Elementary Physiology of the Human Body," asserts that regeneration of the cornea takes place, and even the oldest ophthalmologists2 assume that regeneration of corneal tissue occurs. In fact, Desmarres3 states that, in experimenting on transplantation of the cornea, he has noted an increase in length of the corneal flap, and even a true regeneration. Mauchart,4 Mead and Larry,4 Wardrop,4 Gulz5, and Malgaigne6 resected corneal scars, and found that healing took place with little or no scar. What is extremely interesting in the light of our present knowledge of the effect of an opium derivative, dionin