Share this entry

deuteranopia Syllabification: deu·ter·a·no·pi·a
Pronunciation: /ˌd(y)o͞odərəˈnōpēə/

Definition of deuteranopia in English:


Color-blindness resulting from insensitivity to green light, causing confusion of greens, reds, and yellows. Compare with protanopia.
Example sentences
  • 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.
  • Red-green deficiency (deuteranopia) is the most frequently diagnosed deficiency.
  • But it's important to remember that a measurable percentage of men have red-green colorblindness (deuteranopia); instructing them to click the green box for yes or the red box for no, for example, should be avoided.


Early 20th century: from deutero- 'second' (the color green being regarded as the second component of color vision) + an-1 + -opia.

Definition of deuteranopia in:

Share this entry


What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day innocuous
Pronunciation: ɪˈnɒkjʊəs
not harmful or offensive