Keratoconus (KTCN) is a frequent corneal ectasia characterized by localized corneal thinning and protrusion. Its exact cause is still unknown and is probably multifactorial.
Keratoconus can also be found in sydromic conditions such as Down syndrome, mitral valve prolapse [DS:H00661], Marfan syndrome [DS:H00653], and Ehlers-Danlos syndrome [DS:H00802].
Heon E, Greenberg A, Kopp KK, Rootman D, Vincent AL, Billingsley G, Priston M, Dorval KM, Chow RL, McInnes RR, Heathcote G, Westall C, Sutphin JE, Semina E, Bremner R, Stone EM
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VSX1: a gene for posterior polymorphous dystrophy and keratoconus.