Cornea

Definition:

The clear, front part of the eye that provides 70% of the eye’s refractive power. The cornea is the first part of the eye that bends (or refracts) the light and provides most of the focusing power. The cornea is approximately 500 microns thick (.5 millimeter) and consists of 5 layers: Epithelium, Bowman’s membrane, Stroma, Descemet’s membrane and Endothelium. The Cornea is reshaped during laser eye surgery.