protanopia

[pro″tah-no´pe-ah]

imperfect perception of red, with confusion of reds and greens; called also red blindness. adj., adj protanop´ic.

pro·ta·no·pi·a

(prō'tă-nō'pē-ă),

A form of dichromatism characterized by absence of the red-sensitive pigment in cones, decreased luminosity for long wavelengths of light, and confusion in recognition of red and green.

[G. prōtos, first, + a- priv. + ōps (ōp-) eye]

Farlex Partner Medical Dictionary © Farlex 2012

protanopia

(prō′tə-nō′pē-ə)

A form of colorblindness characterized by defective perception of red and confusion of red with green or bluish green.

pro′ta·nop′ic (-nŏp′ĭk) adj.

protanopia

Ophthalmology Red-green color blindness due to a lack of long wavelength–LW, 560 nm photopigment

pro·ta·no·pi·a

, protanopsia (prō'tă-nō'pē-ă, -nopsē-ă)

Ocular disorder that is a form of dichromatism characterized by absence of the red-sensitive pigment in cones, decreased luminosity for long wavelengths of light, and confusion in recognition of red and green.

[G. prōtos, first, + a- priv. + ōps (ōp-) eye]

Medical Dictionary for the Health Professions and Nursing © Farlex 2012

protanopia

Partial colour blindness with defective perception of red.

Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

protanopia

Type of dichromatism in which only two hues are seen: below 493 nm all radiations appear bluish whereas above it they all appear yellowish. Around 493 nm is the neutral point. The luminosity function of protanopes is significantly decreased for red radiations (for which he or she is almost blind). The condition occurs in about 1.1% of the male population. Syn. red blindness. See dichromatism; pseudoisochromatic plates; neutral point.

pro·ta·no·pi·a

, protanopsia (prō'tă-nō'pē-ă, -nopsē-ă)

Ocular disorder that is form of dichromatism.

[G. prōtos, first, + a- priv. + ōps (ōp-) eye]

Medical Dictionary for the Dental Professions © Farlex 2012

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References in periodicals archive

Na protanopia, ha indicio de descaracterizacao em relacao a cor vista pelo observador sem deficiencia, devido a reducao nos niveis de vermelho e aumento nos niveis de verde e azul (tabela 3).

Caracterizando-se por alto nivel de azul e baixos niveis de vermelho e verde (tabela 4), a amostra sofre alteracoes minimas em seu aspecto quando observado por portadores de protanopia e deuteranopia.

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).

The color blinds vision simulation in the evaluation of color information contained in packages/Uso de simulacao da visao de daltonicos na avaliacao da informacao cromatica contida em embalagens

Both for protanopia (rightmost bars in Figures 5a and 5b) and deuteranopia (rightmost bars in Figures 5c and 5d), [DELTA][h.sub.uv] values were large (between -45.79[degrees] and -34.72[degrees] for protanopia; between -41.35[degrees] and -33.08[degrees] for deuteranopia) and significant (p<0.001).

As in Figure 5, the leftmost bars in Figure 6a show that the [DELTA][h.sub.uv] values were small and the comparisons between Variantor 95% CIs and the predicted values for protanopia were not significant (p>0.05).

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).

Do dichromats see colours in this way? Assessing simulation tools without colorimetric measurements

The study also revealed that 93.3% (14/15) protanopia cases were familial while 6.7% (1/15) were sporadic.

Table I.- Gender wise frequency distribution of protanopia and deuteranopia in Quetta.

Table III.- Frequency distribution of familial and sporadic cases among protanopia and deuteranopia

Incidence of Protanopia and Deuteranopia, Defects of Colour Vision in Quetta, Pakistan

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.

Which of the following is TRUE about the offspring of a mother who is a carder of protanopia and a father who has normal colour vision?

Normal coluor vision and inherited colour vision deficiencies