Definition of deuteranopia in English:



  • Color-blindness resulting from insensitivity to green light, causing confusion of greens, reds, and yellows.

    Compare with protanopia
    • ‘Red-green deficiency (deuteranopia) is the most frequently diagnosed deficiency.’
    • ‘The genetic cause has been determined for several color vision defects, achromatopsia (the loss of all color vision), blue monochromatism, protanopia, deuteranopia, and enhanced S-cone syndrome.’
    • ‘But it's important to remember that a measurable percentage of men have red-green colorblindness (deuteranopia); instructing them to click the green box for yes or the red box for no, for example, should be avoided.’
    • ‘Here's a handy list: primary atypical pneumonia, humectant, lapis lazuli, magniloquent, magnetohydrodynamic, deuteranopia, bryology, vorlage, Wesleyan.’


Early 20th century: from deutero- second (the color green being regarded as the second component of color vision) + an- + -opia.