Cideciyan et al. used the term ABCA4-associated retinal degenerations in 2005 [17] and since then other authors have used the term ABCA4-associated retinopathies [19,20,21]; for the purposes of this review, ABCA4R will be used to denote ABCA4 retinopathies. This evidence concerns the gene ABCA4 and retinal degeneration.