legal blindness


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Related to legal blindness: visual impairment

blindness

 [blīnd´nes]
lack or loss of ability to see (see vision). Legally, blindness is defined as less than 20/200 vision in the better eye with glasses (vision of 20/200 is the ability to see at 20 feet only what the normal eye can see at 200 feet). A person with 20° or less vision (pinhole vision) is also legally blind. In 2002, the number of people classified as legally blind in the United States was estimated at 10 million; millions more had severe visual impairments. The five leading causes of impaired vision and blindness in the United States are age-related macular degeneration, cataract, glaucoma, diabetic retinopathy, and atrophy of the optic nerve. Besides health care problems, issues related to employment, independent living, and literacy should all be considered when caring for patients who are blind. The American Foundation for the Blind is a resource center for information related to visual problems. They can be contacted by calling 1-800-232-5463 or consulting their web site at http://www.afb.org.
blue blindness (blue-yellow blindness) popular names for imperfect perception of blue and yellow tints; see tritanopia and tetartanopia.
color blindness color vision deficiency.
complete color blindness monochromatic vision.
day blindness hemeralopia.
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°.
night blindness see night blindness.
object blindness (psychic blindness) visual agnosia.
red blindness popular name for protanopia.
red-green blindness (red-green color blindness) popular names 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 the glare of the sun upon snow.
total color blindness monochromatic vision.
yellow blindness popular name for tritanopia.

le·gal blind·ness

generally, visual acuity of less than 6/60 or 20/200 using Snellen test types, or visual field restriction to 20° or less in the better eye; the criteria used to define legal blindness vary among different groups.

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.

legal blindness

Medspeak-UK
A condition of one who is "…so blind as to be unable to perform work for which sight is required." –National Insurance Act, 1948.

Medspeak-US
Visual acuity of 20/200 or worse in the better eye with corrective lens.

le·gal blind·ness

(lē'găl blīnd'nĕs)
Generally, visual acuity of less than 6/60 or 20/200 using Snellen test types, or visual field restriction to 20 degrees or less in the better eye; the criteria used to define legal blindness vary.

le·gal blind·ness

(lē'găl blīnd'nĕs)
Generally, visual acuity of less than 6/60 or 20/200 using Snellen test types, or visual field restriction to 20 degrees or less in the better eye; the criteria used to define legal blindness vary.
References in periodicals archive ?
Table 1 Most Common Causes of Age-Related Vision Loss (3-6) Normal Vision Macular Degeneration (age-related) AMD * Leading cause of vision impairment and legal blindness in individuals 50 years and older.
26,260 2,432 Has an eye condition that is considered legal blindness or has been diagnosed as legally blind 56,568 46,422
The definition of legal blindness used in this country requires a best-corrected distance visual acuity of 20/200 or worse in the better eye or a visual field reduction to 20[degrees] in diameter or less.
McKeever's vision deteriorated to the point of legal blindness, he began to compete in para-nordic skiing, with his brother Robin, a 1998 Olympian, skiing in front of him as a reference point or guide.
pdf), a report on the prevalence of sight-threatening eye disease in Americans, addresses the leading causes of visual impairment and legal blindness, including--
The cutoff for legal blindness is 20/200 with corrected vision.
Allegro Ophthalmics offers the potential to prevent vision loss for millions of people, while also liberating others from legal blindness to a much improved quality of life sustained by self-sufficient functional vision.
As time goes on patients may progress to legal blindness and then potentially to near total blindness.
Legal blindness is defined as visual acuity no better than 20/200 (6/60) in the better eye with the best correction.
The result is that vision in the affected eye deteriorates, often to the point of legal blindness.
According to recent national studies, diabetes is responsible for eight percent of legal blindness, making it the leading cause of new cases of blindness in adults 20-74 years annually.
22, 2013 /PRNewswire/ - MaRS client and Investment Accelerator Fund portfolio company eSight Corporation is pleased to announce the launch of eSight eyewear, the first intelligent eyewear that enables people with legal blindness or low vision to see.