ABCA4 and Stargardt disease: Two genes were of specific interest, ABCA4 encoding ATP-binding cassette transporter subfamily A member 4 associated with juvenile onset retinal dystrophies including Stargardt's disease [7], [8], and COL2A1 encoding type II collagen associated with Stickler syndrome [9] in which there is congenital abnormal vitreous and lattice retinal degeneration.