Abstract
This state-of-the-art report includes descriptions of travel aids (Russell's Pathsounder, Kay's ultrasonic spectacles, Benjamin's Laser Cane, and Mims’ Seeing Aid), electronic reading machines (the Optacon and the Cognodictor), and vision substitution systems (the research of Collins and of Brindley). The future prospects for sensory aids are discussed in the light of marketing problems, the interest (and disinterest) of large companies in such research, and present levels of funding.
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