The various devices and techniques available for nonvisual travel may be evaluated in terms of the mobility coverage they provide. However, the coverage provided varies in relation to the function of the device or technique used. The long cane and the various techniques for its use are designed to provide the traveler with object, surface, and foot-placement preview. This article further refines the definition of those functions while specifying each in terms of its measurement.
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Blasch et al. (1996) studied this question.
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