No, they can't. the color blindness is lack of perceptual sensitivity to certain colors, a more precise term is color vision deficiency. The color blindness can see colors, but can not make out the difference between some couples of complementary colors. The most predominant form of color blindness is the loss of reds and greens, and it causes problems in distinguishing reds and greens in the real world. however,It's a great pity that there is no treatment for color blindness.