Apatient 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?

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.