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| In
its most severe forms, color |
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| blindness
is caused by the absence of |
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| one
of the cone visual pigments. |
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| Shown
here, the spectral sensitivities |
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| of
the cone pigments in color normal |
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| trichromats
are compared with those |
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| of
a color blind person. Also compare |
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| the
spectrum as it appears to a color |
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| normal
person with the illustration of |
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| how
it might look to a red-green color |
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| blind person. |
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