Confusion colors 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-pink and grey blue and purple yellow and 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-pink These colors of confusion are defined quantitatively by straight confusion lines plotted in CIEXYZ, usually plotted on the corresponding chromaticity diagram. The lines all intersect at a copunctal point, which varies with the type of color blindness. Chromaticities along a confusion line will appear metameric to dichromats of that type. Anomalous trichromats of that type will see the chromaticities as metameric if they are 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 standard observer may not be isoluminant to a person with dichromacy.
Confusion colors 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-pink and grey blue and purple yellow and 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-pink These colors of confusion are defined quantitatively by straight confusion lines plotted in CIEXYZ, usually plotted on the corresponding chromaticity diagram The lines all intersect at a copunctal point, which varies with the type of color blindness. Chromaticities along a confusion line will appear metameric to dichromats of that type. Anomalous trichromats of that type will see the chromaticities as metameric if they are 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 standard observer may not be isoluminant to a person with dichromacy.