achromatopsia
Achromatopsia is an autosomal recessively inherited visual disorder that is present from birth and that features the absence of color discrimination.
Pathology
3 genes involved
protein-truncation mutations in the GNAT2 gene (1p13).
GNAT2 encodes the cone photoreceptor-specific alpha-subunit of transducin, a G-protein of the phototransduction cascade, which couples to the visual pigment(s) (12077706)