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Simulation of a phosphene field based visual prosthesis

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@ University of Utah

Horch, Kenneth W Normann, Richard A Cha, Kichul

Description

Journal ArticleA visual prosthesis for the blind based upon electrical stimulation of the visual cortex requires the development of an array of electrodes. To establish design specifications for such an electrode array, we have conducted psychophysical experiments with normally sighted subjects wearing a portable 'phosphene' simulator. The simulator consists of a small video camera, a monitor masked by an opaque perforated film, and optical lenses. The visual angle subtended by the masked monitor is 1.7" or less. We measured visual acuity and reading rate as a function of the number of pixels and their spacing. Our results indicate that a phosphene image produced by 600 electrodes implanted in a 1 cmz area near the foveal projection on the visual cortex should provide a limited but useful visual sense for the profoundly blind.
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College of EngineeringBioengineering
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(c) 1990 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. http://dx.doi.org/10.1109/ICSMC.1990.142259
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University of Utah

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Mountain West Digital Library