Definition of protanopia in English:


Line breaks: pro¦tan|opia
Pronunciation: /ˌprəʊtəˈnəʊpɪə


[mass noun]
Colour blindness resulting from insensitivity to red light, causing confusion of greens, reds, and yellows. It is hereditary, and is the commonest form of colour blindness. Also called daltonism. Compare with deuteranopia, tritanopia.
More example sentences
  • Someone pointed out to us yesterday that the current things colour scheme is far from ideal if you suffer from protanopia, deutanopia or tritanopia - colour blindness.
  • 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.


early 20th century: from proto- 'original' (red being regarded as the first component of colour vision) + an-1 'lacking' + -opia.

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