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

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 ?
All affected individuals except for the proband had congenital night blindness, and seven affected members already presented legal blindness. The proband's mother (V:1) and aunt (V:3) had breast cancer, and his father (V:2) had fatty liver disease.
Blurred vision and the inability to recognize faces gradually progress to legal blindness in many cases.
AMD is not as well known as other eye diseases such as cataracts or glaucoma but it is the leading cause of legal blindness for people over the age of 50 in the Western World.
Within approximately twelve months of visual loss in one eye, over 97% of patients experience vision loss in the second eye, subsequently resulting in legal blindness. Worldwide an estimated 35,000 patients, predominantly otherwise healthy adult males, suffer from LHON.
As the baby boom generation ages the number of seniors with vision loss will increase substantially: (2) Legal blindness is defined as a visual acuity of 20/200.
His legal blindness results from the degenerative disorder retinitis pigmentosa.
It's the most common cause of legal blindness in the United States.
In the United States and much of the Western world, AMD is the leading cause of legal blindness in individuals who are 55 years of age and older.
While some researchers use medically-based definitions, such as 'legal blindness' as their criteria, others use functional definitions, such as "not being able to read ordinary print" or "unable to read newspaper print." In education, the requirement that only one disability be identified for the annual child count results in underestimations of the total number of students served by teachers of students with visual impairments (see Kirchner & Diament, 1999 for detailed explanations of these reporting issues).
Infantile glaucoma occurs in one out of every 10,000 births, and cataracts account for 16 percent of all cases of legal blindness in children under the age of five.
The treatment also reduced the chance that patients would progress to legal blindness, and it actually improved vision in 33% of patients, Dr.