COL23A1 and keratoconus: Of the genes suggested in this article as likely causative of keratoconus, 63% had already been linked in at least one article to the disease, and 37% are proposed as possible genes involved in its development (GUCY2D, SLC8A3, DUXA, CPMD8, KRT7, KRT9, GRHL1, CDH23, CDHR1, SLC4A4, ALDH1A2, CPSF3, ADAMST7, IMPG2, COL23A1, ITGB4, INPPL1, IDUA).