dichromacyn.

Brit.

/dʌɪˈkrəʊməsi/, U.S.

/ˌdaɪˈkroʊməsi/

Forms: 1800s dichromasie, 1800s– dichromacy, 1800s– dichromasy.

Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: di- comb. form, -chromasy comb. form.

Etymology: < di- comb. form + -chromasy comb. form, after German Dichromasie (1881 or earlier). Compare earlier dichromatism n. 2.

Ophthalmology and Physiology.

Originally: colour blindness (in humans) in which only two of the primary colours of light can be distinguished. Also (in animals): the type of colour vision resulting from the presence of two types of colour-sensitive photopigment in the retina; an instance of this. Cf. monochromacy n., trichromasy n.The human retina normally contains photopigments sensitive to red, green, and blue light. Absence of one of these, typically occurring as an inherited condition, gives rise to one of the three types of dichromacy (protanopia, deuteranopia, and tritanopia).In many other species, including most mammals, dichromacy is the normal condition.

ΘΚΠ

the world > health and disease > ill health > a disease > disorders of eye > disordered vision > [noun] > colour blindness

Daltonism1841

xanthopsia1842

colour blindness1844

chromatopsia1848

achromatopsia1849

chromatometablepsy1849

chromatopseudopsy1849

acritochromacy1855

dichromatism1859

blue-blindness1868

green-blindness1868

red-blindness1868

chromatopsy1879

red vision1880

dyschromatopsia1890

xanthocyanopy1890

xanthocyanopsy1891

dichromacy1892

monochromatism1893

violet-blindness1894

monochromacy1900

deuteranopia1901

protanopia1902

tritanopia1915

deuteranomaly1932

protanomaly1932

tritanomaly1943

1892 London, Edinb. & Dublin Philos. Mag. 5th Ser. 34 107 This variety [of hue] is wanting in dichromasie, but its place is supplied by an infinity of varieties of tint and shade.

1898 Psychol. Rev. 5 332 It was also made out that the normal dichromacy of the middle zone of the retina is of the kind now known as deuteranopia.

1914 G. M. Whipple Man. Mental & Physical Tests (ed. 3) vi. 184 Nagel..prefers the term anomalous trichromasy to cover the group as a whole and protanomaly and deuteranomaly to distinguish the two main sub-types, analogous to the two main sub-types of dichromasy.

1972 Vision Res. 12 1583 This dichromacy appears to extend to other ground squirrels.

2002 G. H. Jacobs in V. S. Ramachandran Encycl. Human Brain II. 23 The retinas of most mammals (e.g., domestic dogs and cats) contain only two types of cone pigment allowing a basic dichromacy.

This entry has been updated (OED Third Edition, March 2014; most recently modified version published online March 2022).

单词	dichromacy
释义	dichromacyn. Brit. /dʌɪˈkrəʊməsi/, U.S. /ˌdaɪˈkroʊməsi/ Forms: 1800s dichromasie, 1800s– dichromacy, 1800s– dichromasy. Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: di- comb. form, -chromasy comb. form. Etymology: < di- comb. form + -chromasy comb. form, after German Dichromasie (1881 or earlier). Compare earlier dichromatism n. 2. Ophthalmology and Physiology. Originally: colour blindness (in humans) in which only two of the primary colours of light can be distinguished. Also (in animals): the type of colour vision resulting from the presence of two types of colour-sensitive photopigment in the retina; an instance of this. Cf. monochromacy n., trichromasy n.The human retina normally contains photopigments sensitive to red, green, and blue light. Absence of one of these, typically occurring as an inherited condition, gives rise to one of the three types of dichromacy (protanopia, deuteranopia, and tritanopia).In many other species, including most mammals, dichromacy is the normal condition. ΘΚΠ the world > health and disease > ill health > a disease > disorders of eye > disordered vision > [noun] > colour blindness Daltonism1841 xanthopsia1842 colour blindness1844 chromatopsia1848 achromatopsia1849 chromatometablepsy1849 chromatopseudopsy1849 acritochromacy1855 dichromatism1859 blue-blindness1868 green-blindness1868 red-blindness1868 chromatopsy1879 red vision1880 dyschromatopsia1890 xanthocyanopy1890 xanthocyanopsy1891 dichromacy1892 monochromatism1893 violet-blindness1894 monochromacy1900 deuteranopia1901 protanopia1902 tritanopia1915 deuteranomaly1932 protanomaly1932 tritanomaly1943 1892 London, Edinb. & Dublin Philos. Mag. 5th Ser. 34 107 This variety [of hue] is wanting in dichromasie, but its place is supplied by an infinity of varieties of tint and shade. 1898 Psychol. Rev. 5 332 It was also made out that the normal dichromacy of the middle zone of the retina is of the kind now known as deuteranopia. 1914 G. M. Whipple Man. Mental & Physical Tests (ed. 3) vi. 184 Nagel..prefers the term anomalous trichromasy to cover the group as a whole and protanomaly and deuteranomaly to distinguish the two main sub-types, analogous to the two main sub-types of dichromasy. 1972 Vision Res. 12 1583 This dichromacy appears to extend to other ground squirrels. 2002 G. H. Jacobs in V. S. Ramachandran Encycl. Human Brain II. 23 The retinas of most mammals (e.g., domestic dogs and cats) contain only two types of cone pigment allowing a basic dichromacy. This entry has been updated (OED Third Edition, March 2014; most recently modified version published online March 2022). < n.1892
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