What is the frequency of color blindness?

See below: Congenital color blindness is much more common in males since some (the red and green) of the color photopigments are on the x-chromosome (men only have one [xy] while women have two [xx]). Less than 10% of the population has any form of color blindness (there are several types). Acquired color blindness can be due to macular, optic nerve, or brain disease/trauma.