Hereditary Achromatopsia affects about one in 40,000 people, although
it is found in greater proportions in societies that encourage consanguineous marriages.
On the other hand, hereditary Achromatopsia results from of one of four related genetic mutations,
each of which prevents the eye from properly responding to light and color.
Whether caused by a tumor, a stroke, a
blow to the head, or they were just born that way, people with Achromatopsia have a limited or no ability to see color.