One of the mysteries of the English language finally explained.
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.
- ‘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.’
- ‘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.’
Early 20th century: from proto- ‘original’ (red being regarded as the first component of colour vision) + an- ‘lacking’ + -opia.
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