Main Entry: legal blindness Function: noun : blindness as recognized by law which in most states of the U.S. means that the better eye using the best possible methods ofcorrection has visual acuity of 20/200 or worse or that the visual field is restricted to 20 degrees or less —le·gal·ly blindadjective
legal blindness le·gal blindness (lē'gəl) n. Visual acuity of less than 6/60 or 20/200 using Snellen test types, or visual field restriction to 20 degrees or less.