Testing your skills in color vision – gender differences

You might have had the impression that women can see and name more colors than men. You are actually right.

Ten percent of men have some kind of color deficienc: mostly, they cannot distinguish red from green. Color blindness is easy to test: can you see the numbers below? If not, you have some degree of color deficiency.

Yet, how is it that women distinguish more colours than men? You can take a test yourself here:

http://www.xrite.com/custom_page.aspx?pageid=77&lang=en

The scientific explanation lies in the receptors we have in the eyes. Human usually have three receptors: one which distinguish black and white, one for blue and yellow, and the third recept distinguishes red from green (sometimes). Apparently some women can have up to 4 receptors!