black blind
n.— «It’s a common misconception among people that if someone is blind they can’t see at all n what is known as “black blind.” That, however, is not true for the majority of the blind and visually impaired n most have extremely limited vision.» —“Progressive blindness doesn’t slow woman’s guide work” by Kerri Rempp Chadron Record (Nebraska) Apr. 24, 20008. (source: Double-Tongued Dictionary)