blindness /blind·ness/ (blīnd´nes) lack or loss of ability to see; lack of perception of visual stimuli.
day 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.
day blindness (d )n. See hemeralopia. |
day blindness.
See hemeralopia.
day blindness
see hemeralopia.
hemeralopia
Term used to mean either night blindness in which there is a partial or total inability to see in the dark associated with a loss of rod function or vitamin A deficiency; or day blindness in which there is reduced vision in daylight while vision is normal in the dark. Syn. nyctalopia (this term is only synonymous with night blindness); night sight (this term is only synonymous with day blindness). See girate atrophy; congenital stationary night blindness; choroideremia; Oguchi's disease; retinitis pigmentosa.
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