Get Your keratoconus Cross Linking Done By The Best Eye Surgeon in Melbourne Keratoconus is a progressive eye disorder in which the normally round cornea gradually thins and bulges into a cone-like shape. This irregular shaped cornea causes aberrant bending of light, resulting in distorted vision. Keratoconus usually affects both eyes, however it is common for the degree of progression in each eye to be unequal, and for the condition to be significantly more advanced in one eye.