tetartanopia

tetartanopia
te·tar·ta·no·pia te-.tär-tə-'nō-pē-ə n dichromatism in which the spectrum is seen in tones of red and green with blue and yellow replaced by gray

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tet·ar·ta·no·pia (tet″ər-tə-noґpe-ə) [Gr. tetartos fourth + an-1 + -opia] 1. a very rare type of dichromatic vision characterized by retention of the sensory mechanism for two hues only (red and green), lacking that for blue and yellow, which are replaced in the spectrum by an achromatic (gray) band. Some authorities doubt its existence. 2. quadrantanopia.

Medical dictionary. 2011.

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Look at other dictionaries:

  • tetartanopia — noun a form of dichromacy characterized by lowered sensitivity to yellow light; so rare that its existence has been questioned • Syn: ↑yellow blindness • Hypernyms: ↑yellow blue dichromacy, ↑yellow blue color blindness …   Useful english dictionary

  • quadrantanopia — Loss of vision in a quarter section of the visual field of one or both eyes; if bilateral, it may be homonymous or heteronymous, binasal or bitemporal, or crossed, e.g., involving the upper quadrant in one eye and the lower quadrant in the other …   Medical dictionary

  • color vision deficiency — any deviation from normal color vision; these conditions are popularly called by the misleading term color blindness. See monochromatic vision, dichromatic vision, protanopia, deuteranopia, tritanopia, and tetartanopia …   Medical dictionary

  • tetartanopsia — tet·ar·ta·nop·sia (tet″ər tə nopґse ə) tetartanopia …   Medical dictionary

  • dichromatic vision — a color vision deficiency (q.v.) in which one of the three cone pigments is missing altogether. The most common forms are protanopia and deuteranopia, each of which is transmitted by X linked inheritance and affects about 1 per cent of white… …   Medical dictionary

  • yellow-blindness — noun a form of dichromacy characterized by lowered sensitivity to yellow light; so rare that its existence has been questioned • Syn: ↑tetartanopia • Hypernyms: ↑yellow blue dichromacy, ↑yellow blue color blindness …   Useful english dictionary

  • yellow-blue color blindness — noun confusion of yellow and blue • Syn: ↑yellow blue dichromacy • Hypernyms: ↑dichromacy, ↑dichromatism, ↑dichromatopsia, ↑dichromia, ↑dichromasy • Hyponyms: ↑ …   Useful english dictionary

  • yellow-blue dichromacy — noun confusion of yellow and blue • Syn: ↑yellow blue color blindness • Hypernyms: ↑dichromacy, ↑dichromatism, ↑dichromatopsia, ↑dichromia, ↑dichromasy • Hyponyms: ↑ …   Useful english dictionary

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