Tritanopia is a rare form of color blindness caused by the absence of blue-sensitive cones. Blues appear green and yellows appear pink or red.

How rare is tritanopia?

Tritanopia is far rarer than red-green color blindness, affecting roughly 0.008% of the population equally across sexes.

Are blue and yellow still used safely in design?

Yes, but only if the design does not rely solely on that contrast to convey meaning. Adding text labels or distinct shapes ensures accessibility.

The tool shows one simulation at a time. Use the separate protanopia and deuteranopia simulators to check all three conditions.

See how blues and yellows appear to someone with tritanopia using an image or color input.

Simulates how this color appears with Tritanopia (blue-blind).

Color

Original

Tritanopia (blue-blind)

See how blues and yellows appear to someone with tritanopia using an image or color input.

Last updated: 2026-07-01 · Reviewed by Nham Vu