ANSWERS: 2
  • Color blindness is something you are born with so i'd say that the earliest you could probably tell is when your child is old enough to tell you what it sees when you give it a color blindness test. (http://www.everwonder.com/david/colorblind.html)
  • Here is one which does not require letters. Ignore the pitch to order the cards, you and your son should be able to look at the images on your monitor. http://colorvisiontesting.com/online%20test.htm#demonstration%20card

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