Blindness is the condition of lacking visual perception due to physiological or psychological factors.

Various scales have been developed to describe the extent of vision loss and define "blindness"International Council of Ophthalmology. "International Standards: Visual Standards - Aspects and Ranges of Vision Loss with Emphasis on Population Surveys." April 2002.. Total blindness is the complete lack of form and light perception and is clinically recorded as "NLP", an abbreviation for "no light perception". "Blindness" is frequently used to describe severe visual impairment with residual vision. In order to determine which people may need special assistance because of their visual disabilities, various governmental jurisdictions have formulated more complex definitions referred to as legal blindessBelote, Larry. "Low Vision Education and Training: Defining the Boundaries of Low Vision Patients." A Personal Guide to the VA Visual Impairment Services Program. Retrieved March 31, 2006.. In North America and most of Europe, legal blindness is defined as visual acuity (vision) of 20/200 (6/60) or less in the better eye with best correction possible. This means that a legally blind individual would have to stand 20 feet from an object to see it with the same degree of clarity as a normally sighted person could from 200 feet. In many areas, people with average acuity who nonetheless have a visual field of less than 20 degrees (the norm being 180 degrees) are also classified as being legally blind. Approximately ten percent of those deemed legally blind, by any measure, are fully sightless. The rest have some vision, from light perception alone to relatively good acuity. Those who are not legally blind, but nonetheless have serious visual impairments, possess low vision.

By the 10th Revision of the WHO International Statistical Classification of Diseases, Injuries and Causes of Death, low vision is defined as visual acuity of less than 6/18, but equal to or better than 3/60, or corresponding visual field loss to less than 20 degrees, in the better eye with best possible correction. Blindness is defined as visual acuity of less than 3/60, or corresponding visual field loss to less than 10 degrees, in the better eye with best possible correction.

More on [ Blindness ]

Blindness - Twitter Search

Thoroughly enjoyed the Lehigh Valley Council of the Blind holiday party today with many new friends. Solidarity in blindness is wonderful.
Rapunzel1974 (Christie Gilson) Sat, 12 Dec 2009 21:48:31 -0000
Thoroughly enjoyed the Lehigh Valley Council of the Blind holiday party today with many new friends. Solidarity in blindness is wonderful.
I love Navy but I am cheerleading from my couch for Army. Navy just scored a touchdown because Army suffered from temporary blindness.
telekin (Cricket) Sat, 12 Dec 2009 21:45:11 -0000
I love Navy but I am cheerleading from my couch for Army. Navy just scored a touchdown because Army suffered from temporary blindness.
Mount Kilimanjaro: Management capacity is needed to tackle blindness in sub-Saharan Africa http://bit.ly/5IO4dL
emforesta (Emmetta Forestel) Sat, 12 Dec 2009 21:41:57 -0000
Mount Kilimanjaro: Management capacity is needed to tackle blindness in sub-Saharan Africa http://bit.ly/5IO4dL
Mount Kilimanjaro: Management capacity is needed to tackle blindness in sub-Saharan Africa http://bit.ly/8Oo5k9
emforesta (Emmetta Forestel) Sat, 12 Dec 2009 21:41:57 -0000
Mount Kilimanjaro: Management capacity is needed to tackle blindness in sub-Saharan Africa http://bit.ly/8Oo5k9
[ニコニコ動画] 第14位：Blindness 【ミク・ルカ オリジナル】 http://www.nicovideo.jp/watch/sm9047804
topitter (とぴったー) Sat, 12 Dec 2009 21:39:10 -0000
[ニコニコ動画] 第14位：Blindness 【ミク・ルカ オリジナル】 http://www.nicovideo.jp/watch/sm9047804
@Ingeilla lol..i hope the blindness is not staying long
Yermilla (Yermilla ) Sat, 12 Dec 2009 21:35:40 -0000
@Ingeilla lol..i hope the blindness is not staying long

Subscribe to Blindness RSS feed