11. Nine Percent of Men and One-Half Percent of Women are Color-Blind

Color blindness – a term which is misleading – is also known as color vision deficiency or daltonism. Color vision deficiency is not very well known but describes the phenomenon more precisely. Daltonism is named after the first scientist who wrote about color blindness. Most common is a difficulty distinguishing between reds, yellows, and greens. This is called “red-green” color blindness. Other forms, such as problems distinguishing blues from yellows, or where everything looks gray, are very rare.  

Different Types Color Blindness Photos 7 (binary/octet-stream)

Caption: : http://whoatastic.com/different-types-color-blindness-photos-7/

The rule of thumb is that wherever you use color to give specific meaning, you need a redundant coding scheme, for example, color and line thickness so that people who are color-blind will be able to decipher the code without needing to see specific colors.Another approach is to pick a color scheme that works for people who have the various types of color blindness. There are several sites you can use to check how your images or Web site will appear to someone who has color blindness.  www.vischeck.comwww.colorfilter.wickline.org  

Df E2k (binary/octet-stream)

Caption: : https://ux.stackexchange.com/questions/94696/color-palette-for-all-types-of-color-blindness