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

Slide 1

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

Slide 2

• 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.com
• www.colorfilter.wickline.org
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• Caption: https://ux.stackexchange.com/questions/94696/color-palette-for-all-types-of-color-blindness