blindness /blind·ness/ (blīnd´nes) lack or loss of ability to see; lack of perception of visual stimuli.
legal blindness
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.
le·gal blindness (l  g l)n. Visual acuity of less than 6/60 or 20/200 using Snellen test types, or visual field restriction to 20 degrees or less. |
legal blindness
Etymology: L, lex, law; ME, blend, sightless
a state of visual acuity in which no better than 20/200 is measured in the better eye with corrective lenses or a visual field of not more than 20 degrees is obtained.
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