Tritanopia ICD10:H53.5 blue color blindness Congenital tritanopia Blue colour blindness Tritanopia is a very rare color vision disturbance in which there are only two cone pigments present and a total absence of blue retinal receptors. Blues appear greenish, yellows and oranges appear pinkish, and purple colors appear deep red. It is related to chromosome 7. Unlike protanopia and deuteranopia, tritanopia and tritanomaly are not sex-linked traits and can be acquired rather than inherited and can be reversed in some cases. OMIM:190900 Tritan colour blindness Wikipedia:Color_blindness Color-vision disease