Ecological Solutions For The Blind
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A number of inappropriate navigation devices have been foisted onto the visually impaired population over the past twenty years. These portable electronic devices are usually mounted on a long cane adaptation, or hand-held by the visually impaired user. Their function is primarily to help prevent a collision with an obstacle in the immediate path. Some of these navigation devices use laser technology to gauge subject-to-object distance. Others use infrared transceivers or ultrasonic pulse-echo techniques to locate and warn of obstacles. Some extend their role beyond giving warning signals, to crudely assisting the user map the immediate path ahead. These devices exhibit a number of problems, the most significant of which are related to the interface display that conveys navigation/obstacle warning information to the blind user. As sound is often used in these displays, the vital auditory channel is typically compromised. The author has produced a solution, which is at an early stage of development. Several successful prototypes using tactile displays, have been produced.
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Calder, David (2009)Assistive technology devices for the blind are portable electronic devices that are either hand-held or wornby the visually impaired user, to warn of obstacles ahead. Many assistive technology devices use ultrasonic ...
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Calder, David (2009)Top end assistive technology devices for the visually impaired, are sophisticated electronic devices that are either hand-held, attached to a Long Cane or worn by the visually impaired user, to warn of obstacles ahead. ...