deu·​ter·​an·​opia ˌdü-tə-rə-ˈnō-pē-ə How to pronounce deuteranopia (audio)
 also  ˌdyü-
: color blindness marked by usually complete loss of ability to distinguish colors
ˌdü-tə-rə-ˈnō-pik How to pronounce deuteranopia (audio)
 also  ˌdyü-

Examples of deuteranopia in a Sentence

Recent Examples on the Web Red-green color blindness is broadly organized into four types, protanomaly, protanopia, deuteranomaly, and deuteranopia, all of which have to do with how the cones in the eye function. Fernando Alfonso Iii, Houston Chronicle, 19 Dec. 2017 One of these is for players with normal vision; the other three cater to those with protanopia, deuteranopia and tritanopia (which correspond to people’s difficulties sensing red, green and blue light respectively). The Economist, 30 Sep. 2017 The most common type of colour blindness, for example, is deuteranopia. The Economist, 30 Sep. 2017

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'deuteranopia.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


New Latin, from deuter- + a- entry 2 + -opia; from the blindness to green, regarded as the second primary color

First Known Use

circa 1901, in the meaning defined above

Time Traveler
The first known use of deuteranopia was circa 1901

Dictionary Entries Near deuteranopia

Cite this Entry

“Deuteranopia.” Dictionary, Merriam-Webster, Accessed 24 Sep. 2023.

Medical Definition


deu·​ter·​an·​opia ˌd(y)üt-ə-rə-ˈnō-pē-ə How to pronounce deuteranopia (audio)
: color blindness marked by usually complete loss of ability to distinguish colors
deuteranopic adjective

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