Color Blindless

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form of color blindness is called dichromatism.
People with di-chromatic vision tend to confuse red, green, and gray, but can
easily distinguish blue and yellow. Some cannot even see the longest wavelengths
of light -- the red end. Though it is rare, others cannot see the short
wavelengths, near the violet end. These people tend to confuse blue, yellow,
and gray, but not red and green.
Normal vision is called trichromatism. Most color blind people have a
version of trichro-matism called anomalous trichromatism. People with this
condition can see the same colors as people with normal vision, but not as well.
For example, many people with this common form of color blindness are "green-
weak". This means, they see green, but to see the same color normal people see
when green and yellow is mixed, more green must be added. "Green-weak" and
"red-weak" are the most prevalent forms of anomalous trichromatism. The "blue-
weak" form is rare.
Color blindness can be tested in a variety ...

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