Color Vision Learning Center

Learn how color vision works, understand different types of color blindness and discover practical ways to make everyday life, websites, charts and designs easier to see.

Color Blindness Basics

What color blindness is and how color vision works.

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Essential guide

What Is Color Blindness?

Color blindness, more accurately called color vision deficiency, affects how a person sees and distinguishes certain colors. Most people with color blindness still see color, but some shades—especially red, green, blue, or yellow—can be harder to tell apart. Learn how color vision works, what causes color blindness, the different types, common signs, and how color blindness is tested.

Types of Color Blindness

Protan, deutan, tritan and more.

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Essential guide

What Is Deuteranopia?

Deuteranopia is a type of red-green color vision deficiency that makes certain reds, greens, browns, oranges, and purples harder to tell apart. Learn what causes deuteranopia, how it differs from deuteranomaly, what colors are most affected, common signs, and how deutan color vision is tested.