1 out of 255 women and 1 out of 12 men have some form of color vision deficiency.
Take the color challenge, based on the official FM100 Hue Test

A color vision defect does not mean that you are colorblind. There are varying degrees of colorblindness; some people may not be colorblind at all but simply have a more difficult time distinguishing various hues than others with sharper color acuity. Color vision can also indicate certain medical conditions. The Farnsworth- Munsell 100 Hue Test is one of the most widely used tests in industries where color decisions are critical. Over the years the test has also been used in clinical applications for the study of ocular disease and other medical conditions such as diabetes and Parkinson’s disease. It has also been used to determine the affects of pharmaceuticals on color vision.