Color blindness is the "inability to distinguish the differences between certain colors." This happens when there is an absence of color-sensitive pigment in the retina. Usually, this condition is inherited and is there at birth. About one out of every twelve men and one of every twenty women are color blind.

Most often, color blindness is when a person has trouble seeing reds, greens, blues, or a mixture of these colors. The most common type is red-green color blindness, where the person sees reds and greens as the same shade.

Here is an example of what they see:




The typical test for color blindness is based on a person's ability to see numbers inside of a circle.




Answers:
Test 1- 74
Test 2- 29
Test 3- 6
Test 4- Those with normal color vision shouldn't be able to see any number. Most people with red-green color blindness should be able to read a 5.