Color blindness
Also known as Dyschromotopsia. A general term for color vision abnormalities. Heritable dyschromatopsias include red (protan), green (deutan), and blue (tritan) color vision deficits. These deficits may be partial (-omaly) or complete (-opia). Red and green color vision defects are X-linked while loss of the blue receptor (tritanopia) is inherited in an autosomal recessive fashion. Also see: Protanomalous Decreased ability to determine differences between colors, especially shades of red and green. Usually hereditary.