Visual Impairment and Blindness - Research Article from World of Health

This encyclopedia article consists of approximately 4 pages of information about Visual Impairment and Blindness.

Visual Impairment and Blindness - Research Article from World of Health

This encyclopedia article consists of approximately 4 pages of information about Visual Impairment and Blindness.
This section contains 940 words
(approx. 4 pages at 300 words per page)
Buy the Visual Impairment and Blindness Encyclopedia Article

Total blindness is the inability to tell light from dark, or the total inability to see. Visual impairment or low vision is a severe reduction in vision that can't be corrected with standard glasses or contact lenses and reduces a person's ability to function at certain or all tasks. Legal blindness (which is actually a severe visual impairment) refers to a best-corrected central vision of 20/200 or worse in the better eye or a visual acuity of better than 20/200 but with a visual field no greater than 20° (e.g., side vision that is so reduced that it appears as if the person is looking through a tunnel).

Vision is normally measured using a Snellen chart. A Snellen chart has letters of different sizes that are read, one eye at a time, from a distance of 20 ft. People with normal vision are able...

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This section contains 940 words
(approx. 4 pages at 300 words per page)
Buy the Visual Impairment and Blindness Encyclopedia Article
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