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When
people are red-green colorblind, it means that there is something wrong
with one of their cones.
Cones are located in the retina, and allow people to see
different colors.
Cones are also sometimes known as photopigments.
Photopigments are sensitive to three different color groups.
They are long wavelengths (red), medium wavelengths (green) and
short wavelengths (blue).
People who are red-green colorblind base their color vision on
three different photopigments.
These three different photopigments come from only two of the
photopigment groups though.
The technical term describing people who base their color vision
on three different photopigments from two photopigment groups is:
anomalous trichromat.
Colorblindness is very easily diagnosed with the use of special
pictures that blend colors.
If the shapes in the picture can be seen, then the child is not
colorblind.
If one or more of the shapes cannot be seen, further testing is
necessary to determine the degree to which the child is colorblind. |
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