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A patient in the clinic where you work is considered legally blind. the nurse knows that this means the vision in his better eye, corrected by glasses, is what?

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The patient is considered legally blind when his vision in the better eye, and using corrective lens is 20/200 or less.

Legal blindness is a concept used to know the level of visual impairment that is defined by law either to limit some activities (like driving) or to determine eligibility for benefits as a disability.