Color Blindness & Vision

1. Types of Color Vision

Color blindness affects approximately 8% of men and 0.5% of women worldwide. Most people with color blindness aren't completely colorblind—they see colors differently. The three main types relate to which cone cells in the eye are affected.

2. Protanopia (Red-Blind)

Affects ~1% of males. Red appears darker and can be confused with brown, green, or black. Red-green distinctions are very difficult. Traffic lights may appear as different shades of yellow.

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3. Deuteranopia (Green-Blind)

The most common type, affecting ~6% of males. Green and red look similar, often appearing yellowish-brown. This is the most important type to design for due to its prevalence.

4. Tritanopia (Blue-Blind)

Rare, affecting ~0.01% of people. Blue appears greenish, and yellow appears pink or gray. Blue-yellow distinctions are difficult. This type is often acquired rather than inherited.

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5. Designing for Color Blindness

Good contrast helps everyone. Use icons, patterns, or labels alongside color. Avoid problematic combinations like red/green and blue/yellow. Test with simulation tools to verify accessibility.

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