Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/25031

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Title
Simulated prosthetic visual fixation, saccade, and smooth pursuit
Author/Creator
Hallum, L. E.;  Suaning, Gregg Jorgen;  Taubman, D. S.;  Lovell, N. H.
Description
A visual tracking task was administered to 20 subjects afforded simulated prosthetic vision (a phosphene array); a total of 3 h data was taken from each subject over the course of 10 visits. The experiment assessed prosthetic visual fixation, saccade and smooth pursuit and the effect of practice. Further, we demonstrated an image analysis technique that assisted fixation and pursuit (but not saccade) accuracy, and required less vigorous movement of the phosphene array in pursuing the target. As measured by mean deviation from the target, fixation and pursuit accuracies were improved by 8.3 and 3.3 min of visual arc, respectively (35.8% and 6.8%), for inter-phosphene spacing of 1.9degrees. The analysis technique, involving overlapping Gaussian kernels, was an heuristic design; this is the first step of an iterative, experimental approach to devising effective image analysis to be contained in an electronic vision prosthesis. The approach should ultimately afford implanted patients improved prosthetic visual function. (C) 2004 Elsevier Ltd. All rights reserved.
Relation
Vision Research Vol. 45, no. 6, p. 775-788
Date
2005
Publisher
Pergamon Press
Keyword(s)
prosthetic vision;  vision prosthesis;  psychophysics;  linear filtering;  visual tracking;  pixelized vision system;  electrical-stimulation;  eye-movements;  coordination control;  amblyopic eyes;  tracking;  performance;  speech;  retina;  muscle
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/25031
Identifier
ISSN:0042-6989
Language
eng
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Subject
"Vision Research"
 
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