red-blindness
/ˈrɛdˌblʌɪn(d)nɪs/Medicine and Physiology
noun
A form of abnormal colour vision characterized by reduced perception of light at the red end of the spectrum; = protanopia. Also: colour vision or photosensitivity of this kind as a normal characteristic of a species.
Origin
Mid 19th century. From red + blindness, after German Rothblindheit. Compare slightly later red-blind.