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Webvision: Color Perception <br />Q3: A4 04 <br />x <br />Page 14 of 18 <br />I i:mzre 2S. Chromaticit3, co-orciittatec of fhe colours of tlae Fa=7i�u orth Parte( D-15 fro n Tienjanain, lA . T,S�rtil, fiarisii's ^finicef action. Philadelphia: <br />W. B Saunders Cornpanv, 1998).��RcE mtag�. — -- <br />Patients are asked to arrange 15 coloured caps in sequential order based on similarity from the <br />pilot colour cap (figure 24). <br />Figure 24. r'arns'arorth Panel D -15:–L2 5 K. tpeei1 ±1 <br />The type of colour vision defect can be detected from their arrangement of the caps. These colour <br />caps are arranged in a particular fashion due to the confusion of colours that lie on the confusion <br />lines (figure 25). The criterion for failure in the Panel D-15 test is two or more major crossings (ie, <br />greater than a two cap error). Deutan, protan and tritan will produce characteristic errors <br />(crossings) according to their confusion lines. Rod monochromats are colour blind and their VI <br />peaks at about 507 nm. They arrange the D-15 caps according to the scotopic reflectance of the D- <br />15 caps. <br />Tsliw itrd' <br />Fimve 25. The Farnsworth Panel D-15 results from patients tivith various colour v±cion defects. llie rod menochromaik results are idealised to itlustrate the <br />scotopic axis along 5-14. As a rule, rod monochr2Mats rive variable results tXith a tendencv of erose errors to fatl atone the 5-14 axis -CI ih it?- umaeee. <br />Other arrangement colour tests include the L'Anthony's Desaturated Panel D-15, saturated H-16 <br />and the Farnsworth 100 -Hue Test. The desaturated panel D-15 is particularly useful in the early <br />http://www.webvision. med.utah.edu/KallColor.html <br />6/18/01 <br />