New developments in mobility and orientation aids for the blind.
D001296:Audiovisual Aids; D001766:Blindness; D004582:Electronics, Medical / Q000295:instrumentation*; D006801:Humans; D008124:Locomotion; D012656:Self-Help Devices; D012682:Sensory Aids; D014195:Travel; D014465:Ultrasonics / Q000295:instrumentation