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Webvision: Color Perception <br />deutanomaly <br />I 5% <br />0.4% <br />tritanomaly <br />rare <br />rare <br />Dichromasy <br />[protanopia <br />1% <br />0.01% <br />deuteranopia <br />1.5% <br />0.01% <br />tritanopia* <br />0.008% <br />0.008% <br />Monochromasy <br />rod monochromasy <br />rare <br />rare <br />cone monochromasy <br />rare <br />rare <br />atypical monochromasy <br />very rare <br />very rare <br />Page 11 of 18 <br />Modified after Cole (1972), Pease (1998) and estimates from Fright (1952) * <br />Dichromasy and anomalous trichromasy can be classified according to the affected cone photopigment. <br />Three terms that are used also used to describe CVD are protan, deutan and tritan (from the Greek protos <br />first, deuteros second and tritos third; the order the colour vision deficiencies were described). A <br />protan has the longer wavelength cone photopigment missing or anomalous, a deutan has the middle <br />wavelength cone photopigment missing or anomalous and the tritan has the shorter wavelength cone <br />photopigment missing or anomalous. (figure 17). <br />� t2ri7ienop8. �fmssk'r� tonyser swhs>31ent5tt+ atr� Fht�iir.�sin'-a��t: <br />t�TDTr76t. <br />vralanomat:OrW6&�alonger tRmgtu^ ftlb OweAwnj*'Oy t <br />K}GkUe`�atY@l3�CQ"�rldd{F"tC.iufilrttli ilt.�Ke`�.•n'a'�r1p�t+'".tF�; <br />D�iSXPIFd ''"`� <br />RGUtO40ADOW OvOMa)W'=WJO uMVon@tt+ tkW PY**0..eAO <br />ilitodu@� (Yi'r��h9aR i��ri�7ltr talh". P`+��%€�?'r3t�! <br />?Fi�fPRt <br />TiC9nfioas� � (tix.�ms�art uyv�l�y3t+� ���' <br />Fidire 17. Classification accordizty to fire cony photnprigrnenY of Lded}.(21 I jpee isna�e; <br />The pattern of inheritance for deutan (red -green) CVD is sex-linked recessive while tritan CVD has an <br />autosomal dominant inheritance. The genetics of CVD is particularly important in the clinic as patients <br />are often keen to understand why they are CVD and whether they will pass their CVD to their children. <br />For some time it was thought that congenital inherited tritanopia did not exist because so few cases had <br />been reported. Also, tritan-like colour vision deficiencies are associated with disease, making it essential <br />to discriminate between acquired and congenital tritan defects. The existence of congenital inherited <br />http://www.webvision.med.utah.edu/KallColor.html 6/18/01 <br />