ABCA4 and Usher syndrome: Thirty (60%) had RPGR-related retinal dystrophy, nine (18%) had ABCA4-Stargardt disease, five (10%) had KCNV2-related retinal dystrophy, three (6%) had RDH12-related retinal dystrophy, two (4%) had Achromatopsia, and one (2%) had Usher syndrome.