Blind People - Signs and Symptoms

Signs and Symptoms

Blindness is defined by the World Health Organization as vision in a person's best eye of less than 20/500 or a visual field of less than 10 degrees. This definition was set in 1972 and there is ongoing discussion on if it should be altered somewhat.

Read more about this topic:  Blind People

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Famous quotes containing the words symptoms and/or signs:

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