if you can become "colorblind" how would that happen and what specific type of "colorblindness", like protanomaly or Deuteranomaly?

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Answers:    About 5% of guys within the U.S. are born with it, presumably because European potato farmers who could not see the blight (were colorblind) migrated to the U.S.

http://www.amazon.com/Coping-Colorblindn...
describes several ways colorvision can be compromised after birth..

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genetic.. http://en.wikipedia.org/wiki/Colourblind this has lots of info.

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It is just genetic.

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