title: A preliminary followup study of electronic travel aid users.
mesh_terms: D001766:Blindness; D002183:Canes; D005069:Evaluation Studies as Topic; D005190:Family; D005500:Follow-Up Studies; D006801:Humans; D007834:Lasers; D008297:Male; D008875:Middle Aged; D009983:Orthopedic Equipment; D012682:Sensory Aids; D014195:Travel; D014465:Ultrasonics