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By the 10th Revision of the [[World Health Organization|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.[http://www3.who.int/icd/currentversion/fr-icd.htm][http://www.who.int/mediacentre/factsheets/fs282/en/]
By the 10th Revision of the [[World Health Organization|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.[http://www3.who.int/icd/currentversion/fr-icd.htm][http://www.who.int/mediacentre/factsheets/fs282/en/]
==Primary Prevention==
There exist a number of organizations, such as [[International Agency for the Prevention of Blindness]], [[ORBIS International]], and [[Seva Foundation]], who have developed programs aimed at preventing blindness.
On September 10, 2007,  in a 6-year study, [[researchers]], led by John Paul SanGiovanni of the [[National Eye Institute]], [[Maryland]] found that [[Lutein]] and zeaxanthin ([[nutrients]] in [[Egg (food)|eggs]], [[spinach]] and other [[green]] [[vegetables]]) protect against blindness ([[macular degeneration]]), affecting 1.2 million [[United States|Americans]], mostly after age 65. Lutein and zeaxanthin reduce the risk of [[AMD]] ([[journal]] [[Archives of Ophthalmology]]). Foods considered good sources of the nutrients also include [[kale]], [[turnip]] [[greens]], [[collard]] greens, [[romaine lettuce]], [[broccoli]], [[zucchini]], [[corn]], [[garden]] [[peas]] and [[Brussels sprouts]].<ref>[http://news.yahoo.com/s/nm/20070910/hl_nm/eyesight_nutrients_dc;_ylt=AhJwo077jBEbQvMoRIMIxV2s0NUE  Yahoo.com, Study finds spinach, eggs ward off cause of blindness]</ref>


==References==
==References==
{{Reflist|2}}
{{Reflist|2}}
[[Category:Blindness]]
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[[Category:Blindness]]

Latest revision as of 20:39, 29 July 2020

Blindness Microchapters

Home

Patient Information

Overview

Historical Perspective

Classification

Pathophysiology

Causes

Differentiating Blindness from other Diseases

Epidemiology and Demographics

Risk Factors

Screening

Natural History, Complications and Prognosis

Cultural Aspect

Diagnosis

History and Symptoms

Physical Examination

Other Imaging Findings

Other Diagnostic Studies

Treatment

Adaptive Tools and Techniques

Medical Therapy

Surgery

Primary Prevention

Cost-Effectiveness of Therapy

Future or Investigational Therapies

Case Studies

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Saumya Easaw, M.B.B.S.[2]

Overview

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

Various scales have been developed to describe the extent of vision loss and define "blindness."[1] Total blindness is the complete lack of form and light perception and is clinically recorded as "NLP," an abbreviation for "no light perception."[1] Blindness is frequently used to describe severe visual impairment with residual vision. Those described as having only "light perception" can see no more than the ability to tell light from dark. A person with only "light projection" can tell the general direction of a light source.

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 blindness.[2] 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 (6 m) from an object to see it with the same degree of clarity as a normally sighted person could from 200 feet (60 m). 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, have no vision. The rest have some vision, from light perception alone to relatively good acuity. Low vision is sometimes used to describe visual acuities from 20/70 to 20/200. [3]

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.[4][5]

Primary Prevention

There exist a number of organizations, such as International Agency for the Prevention of Blindness, ORBIS International, and Seva Foundation, who have developed programs aimed at preventing blindness.

On September 10, 2007, in a 6-year study, researchers, led by John Paul SanGiovanni of the National Eye Institute, Maryland found that Lutein and zeaxanthin (nutrients in eggs, spinach and other green vegetables) protect against blindness (macular degeneration), affecting 1.2 million Americans, mostly after age 65. Lutein and zeaxanthin reduce the risk of AMD (journal Archives of Ophthalmology). Foods considered good sources of the nutrients also include kale, turnip greens, collard greens, romaine lettuce, broccoli, zucchini, corn, garden peas and Brussels sprouts.[3]

References

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