CNGA3 and achromatopsia: Currently, six genes, including CNGA3 (OMIM 600053), CNGB3 (OMIM 605080), GNAT2 (OMIM 139340), ATF6 (OMIM 605537), PDE6C (OMIM 600827), and PDE6H (OMIM 601190), are recognized as responsible for more than 90% of ACHM cases (Abdelkader et al., 2018; Liang et al., 2015).