Retinal Cone Dystrophy 3a, also known as achromatopsia 6, is related to cone dystrophy with supernormal rod response and retinal cone dystrophy 3b, and has symptoms including photophobia An important gene associated with Retinal Cone Dystrophy 3a is PDE6H (Phosphodiesterase 6H). Affiliated tissues include retina, and related phenotypes are photophobia and reduced visual acuity