# tritanopia

> English word · Noun

## Definitions
1. A form of color blindness in which the retina is deficient in or lacks cone cells containing opsins that respond to the color blue, resulting in an inability to distinguish blue from green.

## Etymology
From trito- (“third (color)”) + an- (“without”) + -opia (“vision”).

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/tritanopia