Potential phenocopies of the optical gap appearance on OCT imaging include achromatopsia (associated with CNGA3 or CNGB3 mutations), cone dystrophy (associated with GUCY2D or other genes), RP1L1-associated occult macular dystrophy, and acquired diseases such as solar retinopathy [26,27]. The gene discussed is RP1L1; the disease is achromatopsia.