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"Color blindness, or Daltonism , named after the Physicist John Dalton (who was a color blind himself).
Color Blinds can detect colors, but with several deficiencies in seeing the colors.Only 8% from population are daltons, most of them are men and only 1% are women."
This would make my wife a pretty rare breed- she can't see most of the numbers shown in the above pictures. Her father aced the entrance exam to the Turkish Navy, but because he was proven to be color-blind, he was denied admission. I know that this was a crushing disappointment for him. (He's now a retired math teacher- but still a staunch Socialist and Athiest) Sadly, I need to have our son Reis tested when he awakes tomorrow morning, because:
"Daltonism is a genetic character which is carried in heredity on a recessive gene on the X gender chromosome.Therefore women may be carriers of the deficiency and pass it to their sons. A son to a dalton mother will definitely be dalton too, while son of a carrier mother may have a normal sight."Many more tests are found HERE