Legal blindness

The definition varies from country to country. In the United States, the definition of legal blindness is: {{}}Visual acuity of 20/200 or worse in the better eye with corrective lenses (20/200 means that a person must be at 20 feet from an eye chart to see what a person with normal vision can see at 200 feet): or Visual field restriction to 20 degrees diameter or less (tunnel vision) in the better eye. Note that these criteria are used to determine eligibility for government disability benefits and do not necessarily indicate a person's ability to function.

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legal blindness n blindness as recognized by law which in most states of the U.S. means that the better eye using the best possible methods of correction has visual acuity of 20/200 or worse or that the visual field is restricted to 20 degrees or less

le·gal·ly blind adj

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blindness as defined by law; in most states of the United States, maximal visual acuity of the better eye, after correction, of 20/200 or less, with a total diameter of the visual field in that eye of 20 degrees or less.