[ ˌdju:t(ə)rə'nəʊpɪə ]
■ noun colour blindness resulting from insensitivity to green light, causing confusion of greens, reds, and yellows. Compare with protanopia , tritanopia .
Origin
early 20th cent.: from deutero- 'second' (green being regarded as the second component of colour vision) + an- 1 + -opia .