References in periodicals archive ?
Viewers that experience abnormalities in color vision can be classified as exhibiting anomalous trichromacy (all three color pigments are present, but one of them is anomalous), dichromacy (only two of the pigments are present), and monochromacy (a single pigment or none at all; the rarest of the three)[9].
There are three types of inherited CVD: monochromacy, dichromacy and anomalous trichromacy.
In its congenital form, there is a complete absence of cone cell activity, a condition also referred to as 'rod monochromacy' or 'total colour blindness.' A less severe form of the disorder is called dyschromatopsia, the most common symptom being 'hemeralopia' and as a result, achromatopsia frequently leads to photophobia.