Affiliation:
1. Blind Mobility Research Unit, University of Nottingham, England.
Abstract
The Nottingham Obstacle Director (NOD) is an ultrasonic handheld aid designed to help visually handicapped people detect obstacles as they travel. NOD emits pulses of high-frequency sound up to 7½ feet ahead of the user. The pocket-sized secondary device requires little training and is intended to be used with a primary aid (long cane, dog guide). This article describes the development of the NOD and the results of two evaluation studies that tested the efficacy of the device.
Subject
Rehabilitation,Ophthalmology
Cited by
21 articles.
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