red blindness

blindness /blind·ness/ (blīnd´nes) lack or loss of ability to see; lack of perception of visual stimuli.

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blue blindness , blue-yellow blindness popular names for imperfect perception of blue and yellow tints; see tritanopia and tetartanopia .

color blindness 

1. popular name for color vision deficiency.

2. see monochromatic vision.

complete color blindness  monochromatic vision.

day blindness  hemeralopia.

flight blindness  amaurosis fugax due to high centrifugal forces encountered in aviation.

green blindness  imperfect perception of green tints; see deuteranopia and protanopia.

legal blindness  that defined by law, usually, maximal visual acuity in the better eye after correction of 20/200 with a total diameter of the visual field in that eye of 20 degrees.

letter blindness  alexia characterized by inability to recognize individual letters.

music blindness  musical alexia.

night blindness  failure or imperfection of vision at night or in dim light.

object blindness , psychic blindness visual agnosia.

red blindness  popular name for protanopia.

red-green blindness  popular name for any imperfect perception of red and green tints, including all the most common types of color vision deficiency. See deuteranomaly, deuteranopia, protanomaly, and protanopia.

snow blindness  dimness of vision, usually temporary, due to glare of sun upon snow.

text blindness  alexia.

total color blindness  monochromatic vision.

word blindness  alexia.

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red blindness.

See protanopia.

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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.