Biallelic mutations in ABCA4 are found in most patients with autosomal recessive STGD (arSTGD) [4] as well as in some patients with autosomal recessive retinitis pigmentosa (arRP) [5] and autosomal recessive cone-rod dystrophy (arCRD) [6]. This evidence concerns the gene ABCA4 and autosomal recessive retinitis pigmentosa.