[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 红色盲。 亦称 daltonism
语源
early 20th cent.: from proto- 'original' (red being regarded as the first component of colour vision) + an- 'lacking' + -opia