Designing Color Blindness Friendly Interfaces

Understanding Color Blindness

About 8% of men and 0.5% of women have some form of color vision deficiency. The most common types affect red-green perception.

Types of Color Blindness

• Deuteranopia (green-blind): Most common, ~6% of men
• Protanopia (red-blind): ~2% of men
• Tritanopia (blue-blind): Rare, affects both sexes equally
• Monochromacy: Very rare, complete color blindness

Design Principles

• Never rely on color alone to convey information
• Use icons, patterns, or text labels alongside colors
• Ensure sufficient luminance contrast (not just hue contrast)
• Choose color combinations that work for colorblind users
• Test with color blindness simulation tools

Safe Color Combinations

<!-- Instead of red/green for status -->
<span class="text-emerald-600">✓ Success</span>
<span class="text-red-600">✕ Error</span>

<!-- Better: Add icons/labels -->
<span class="flex items-center gap-1 text-emerald-600">
  <svg><!-- checkmark icon --></svg>
  Saved successfully
</span>
<span class="flex items-center gap-1 text-red-600">
  <svg><!-- x icon --></svg>
  Failed to save
</span>

<!-- Chart alternatives -->
<div class="bg-blue-500" title="Category A: 45%"></div>
<div class="bg-amber-500" title="Category B: 30%"></div>
<!-- Blue and amber have good luminance contrast -->

Color Pairs That Work

• Blue + Orange (good luminance contrast)
• Blue + Yellow (works for most types)
• Purple + Yellow (high contrast)
• Dark blue + Light orange
• Avoid: Red + Green, Red + Brown, Green + Brown