Cone Dystrophy with Supernormal Rod Response, also known as cone dystrophy with supernormal rod electroretinogram, is related to cone dystrophy and color blindness, and has symptoms including photophobia An important gene associated with Cone Dystrophy with Supernormal Rod Response is KCNV2 (Potassium Voltage-Gated Channel Modifier Subfamily V Member 2). Affiliated tissues include eye and retina.