371.6 OMIM 148300 DiseasesDB 7158 MedlinePlus 001013 eMedicine oph/104 Keratoconus (from Greek : kerato- horn, cornea; and konos cone) is a degenerative disorder of the eye in which structural changes within the cornea cause it to thin and change to a more conical shape than its normal gradual curve . Keratoconus