Editing Color blindness (section)

===Confusion colors===
[[File:Color Blind Confusion Lines.png|thumb|upright=1.8|Confusion lines for the three types of dichromacy superimposed on CIEXYZ color space]]
Confusion colors are pairs or groups of colors that will often be mistaken by the color blind. Confusion colors for red–green color blindness include:
* cyan and grey
* [[rose (color)|rose-pink]] and grey
* blue and purple
* yellow and [[Shades of green#Neon green|neon green]]
* red, green, orange, brown
Confusion colors for tritan include:
* yellow and grey
* blue and green
* dark blue/violet and black
* violet and yellow-green
* red and [[Rose (color)|rose-pink]]
These colors of confusion are defined quantitatively by straight confusion lines plotted in [[CIEXYZ]], usually plotted on the corresponding [[CIE 1931 color space#CIE xy chromaticity diagram and the CIE xyY color space|chromaticity diagram]]. The lines all intersect at a ''copunctal point'', which varies with the [[#Based on affected cone|type of color blindness]].<ref>{{cite journal |last1=Fomins |first1=S |title=Multispectral analysis of color vision deficiency tests |journal=Materials Science |date=2011 |volume=17 |issue=1 |pages=104–108 |doi=10.5755/j01.ms.17.1.259|doi-access=free }}</ref> [[Chromaticity|Chromaticities]] along a confusion line will appear [[Metamerism (color)|metameric]] to [[#Dichromacy|dichromats]] of that type. [[#Anomalous trichromacy|Anomalous trichromats]] of that type will see the chromaticities as metameric if they are [[Color difference|close enough]], depending on the strength of their CVD. For two colors on a confusion line to be metameric, the chromaticities first have to be made ''isoluminant'', meaning equal in [[lightness]]. Also, colors that may be isoluminant to the [[CIE 1931 color space#CIE standard observer|standard observer]] may not be isoluminant to a person with dichromacy.