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Low vision
From ATWiki
People with normal visual acuity have what is known as 20/20 vision, meaning that they can see normally what should be able to be seen at 20 feet. A person with 20/60 vision, however, can only see what a normal person could see at 60 feet if they move up to 20 feet[1].
The World Health Organization defines vision impairment is having any uncorrectable reduced vision where:
- 20/30 to 20/60 is considered mild vision loss, or near-normal vision
- 20/70 to 20/160 is considered moderate visual impairment, or moderate low vision
- 20/200 to 20/400 is considered severe visual impairment, or severe low vision
- 20/500 to 20/1,000 is considered profound visual impairment, or profound low vision
- less than 20/1,000 is considered near-total visual impairment, or near total blindness
- no light perception is considered total visual impairment, or total blindness [2]
"There are other important vision skills, including peripheral awareness or side vision, eye coordination, depth perception, focusing ability and color vision that contribute to your overall visual ability."[3]
"In the United States, any person with vision that cannot be corrected to better than 20/200 in the best eye, or who has 20 degrees or less of visual field remaining, is considered legally blind."[4]
In 2002, the three leading causes of low vision and blindness world-wide were cataracts, glaucoma, and age-related macular degeneration (AMD).[5]
