Info on the 3 variations: http://www.iamcal.com/toys/colors/
Wiki page: http://en.wikipedia.org/wiki/Color_blindness
Wiki page: http://en.wikipedia.org/wiki/Color_blindness
Another test: http://www.color-blindness.com/color-blindness-tests/
Good site for general info and links: http://www.toledo-bend.com/colorblind/Ishihara.asp
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