Keratoconus is a congenital (condition from birth) disease of the cornea and it belongs to the large group of hereditary corneal dystrophies.
Keratoconus is a fairly uncommon condition that affects the cornea (the transparent window at the front of the eye). It is mostly congenital. It can also occur as a complication of LASIK when the condition is called ectasia.
Keratoconus causes changes within the structure of the cornea making it weaker and thin resulting in a ‘cone shaped’ forward bulge. Keratoconus leads to myopia (short sight) and, if the steepening is uneven, also astigmatism. With Keratoconus, visual distortion can become difficult to correct with spectacles, although contact lenses (usually rigid) can provide more functional visual performance.