protanopia

pro ta no pi a |ˌprōtəˈnōpēə ˌproʊdəˈnoʊpiə | ▶noun color-blindness resulting from insensitivity to red light, causing confusion of greens, reds, and yellows. It is hereditary and is the most common form of color-blindness. Also called daltonism. Compare with deuteranopia, tritanopia. ORIGIN early 20th cent.: from proto- ‘original ’ (red being regarded as the first component of color vision ) + an- 1 ‘lacking ’ + -opia .

protanopia

protanopia |ˌprəʊtəˈnəʊpɪə | ▶noun [ 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. ORIGIN early 20th cent.: from proto- ‘original ’ (red being regarded as the first component of colour vision ) + an- 1 ‘lacking ’ + -opia .