deuteranopia


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Related to deuteranopia: protanopia, deuteragonist

deuteranopia

 [doo″ter-ah-no´pe-ah]
defective color vision, with confusion of greens and reds, and retention of the sensory mechanism for only the hues of blue and yellow. adj., adj deuteranop´ic.

deu·ter·an·o·pi·a

(dū'tĕr-ă-nō'pē-ă),
A congenital abnormality of the retina in which there are two rather than three retinal cone pigments (dichromatism) and complete insensitivity to middle wavelengths (green).
[G. deuteros, second, + anopia]

deuteranopia

(do͞o′tər-ə-nō′pē-ə, dyo͞o′-)
n.
A form of colorblindness characterized by insensitivity to green.

deu′ter·a·nope′ (-nōp′) n.
deu′ter·a·nop′ic (-nŏp′ĭk, -nō′pĭk) adj.

deuteranopia

Ophthalmology Red-green color blindness caused by a lack of middle wavelength–530 nm photopigment. See Color blindness.

deu·ter·an·o·pi·a

, deuteranopsia (dū'tĕr-ă-nō'pē-ă, -opsē-ă)
A congenital abnormality of the retina in which there are two rather than three retinal cone pigments (dichromatism) and complete insensitivity to middle wavelengths (green).
[G. deuteros, second, + anopia]

deuteranopia

A form of colour blindness (colour perception defect) causing a tendency to confuse blues and greens, and greens and reds and with a reduced sensitivity to green.

deuteranopia

Type of dichromatism in which red and green are confused, although their relative spectral luminosities are practically the same as in normals. In the spectrum, the deuteranope only sees two primary colours, the long wavelength portion of the spectrum (yellow, orange or red) appears yellowish and the short wavelength portion (blue or violet) appears bluish. There is, in between, a neutral point which appears whitish or colourless, at about 498 nm. It occurs in slightly over 1% of the male population and only rarely in females. Syn. green blindness (although this term is incorrect as green lights appear to a deuteranope as bright as to a normal observer). See defective colour vision; dichro-matism.
References in periodicals archive ?
O azul ciano (R 0, G 170, B 214), que identifica o 'sabor original', quando observado por um portador de deficiencia dos tipos protanopia e deuteranopia mantem-se na faixa do azul, mas torna-se menos esverdeado e menos saturado (figura 4).
Para o portador de deuteranopia, tambem ha aumento no nivel de vermelho, neste caso modificando o angulo do matiz no espectro visivel para 38[degrees] e tornando a percepcao da cor mais distante da sua aparencia projetada.
Isto ocorreu sobretudo nas simulacoes da protanopia e deuteranopia, nas quais a percepcao da cor vermelha e perdida (figuras 2 e 4), alem das distorcoes observadas em outras cores, a baixa saturacao e o escurecimento, modificando os tipos e intensidade dos contrastes.
Figure 5 also highlights a singular fact related to [L.sub.R] deuteranopia simulations (Figure 5d): [DELTA][L.sub.R] values had different sign depending on the pseudoachromatic stimuli and simulation tool considered.
Regarding the comparisons between empirical Variantor 95% CIs and deuteranopia predicted values (leftmost bars in Figures 6c and 6d), there were significant and big differences both in [DELTA][h.sub.uv] (p<0.01, between 8.20[degrees] and 11.71[degrees]) and [DELTA][L.sub.R] (p<0.001, between -0.34 and 0.16).
Figure 6 shows that none of the Coblis simulations was accurate both for protanopia (rightmost bars in Figures 6a and 6b) and deuteranopia (rightmost bars in Figures 6c and 6d).
Data were statistically analyzed on SPSS-16 to find out frequencies of protanopia and deuteranopia among the studied population.
Table I.- Gender wise frequency distribution of protanopia and deuteranopia in Quetta.
The diagnosis of deuteranopia was established by failure on the Ishihara Test and by finding a full matching range at the Nagel anomaloscope without reduction of yellow brightness at the red end of the matching range.
However, people with deuteranopia have normal red-absorbing and blue-absorbing cones, which means their blue-yellow neural pathway continues to operate with inputs from the blue- and red-absorbing cones.
Protanopia and deuteranopia are inherited as an X-linked recessive trait.
The inheritance pattern for protanomaly and deuteranomaly is the same as for protanopia and deuteranopia.