The genes involved in cone degeneration, CNGB3, CNGA3 and GNAT2, and the genes involved in cone-rod dystrophy, ABCA4, RDH5, Cord8, Cord9, RPGRIP1, GUCY2D and CRX, were all excluded from being involved in the cone-rod dystrophy described in this family of SWHD. Here, GUCY2D is linked to Cone rod dystrophy.