Our grandson, the one in my avatar, is colorblind. It was discovered this past summer when he had his eyes checked for Kindergarten...He's had 2 yrs of preschool and seems to fake it well or knows how to compensate fairly well. There were times when we questioned his answers about color, but somehow he'd change his mind and get it right. He is red/green colorblind. My dad was colorblind and this is my daughter's child.