Biallelic gene defects in CACNA2D4 (OMIM #608171) have been associated with autosomal recessive cone dystrophy (RCD4, OMIM #610478)[1], nonprogressive retinal dysfunction[2], and more recently with retinitis pigmentosa[3] and cone-rod dystrophy [4]. Here, CACNA2D4 is linked to retinitis pigmentosa.