In comparison, achromatopsia is a congenital autosomal recessive cone dysfunction with a presumed stationary nature (e.g., GNAT2, ATF6...) [29,30], however, it has been suggested that it can sometimes show a predominantly stable genotype with a variable degree of retinal changes (e.g., CNGA, CNGB3...) [31,32] or genotype with a progressive loss of cone photoreceptors (e.g., PDE6C...) [33,34]. Here, GNAT2 is linked to achromatopsia.