Cornea - a front part of an external fibrous envelope of an eyeball; nonvascular, high-sensitivity, transparent, an optically homogeneous envelope with smooth, a smooth surface. Except for protective and basic function the cornea is the main refracting surface of optical system of an eye.Diseases of a cornea makes about 25 % of the general number of diseases of eyes, and quite often are the reasons of blindness and lowering of...