Figure 1. Distribution of achromatopsia causative genes before (A) and after (B) the identification of the CNGB3 c.1663–1205G>A variant. CNGB3 c.1663–1205G>A is one of the two common CNGB3 mutations in our cohort. The letter “n” represents the number of families, and this number is followed by their proportion among all ACHM families in our cohort. Patients with one heterozygous mutation were considered unsolved, and they were added to the “unknown” group in panel B.