CNGA3 and achromatopsia: Over 70% of ACHM cases are caused by mutations in CNGA3 and CNGB3 genes with the proportion of ACHM cases caused by CNGB3 mutation reached 50% (Kohl et al., 2005; Mayer et al., 2017; Georgiou et al., 2020; Brunetti-Pierri et al., 2021).