Journal
OPTOMETRY AND VISION SCIENCE
Volume 85, Issue 11, Pages 1057-1063Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/OPX.0b013e31818b9f36
Keywords
low vision; low vision rehabilitation; prosthetic vision; retinal prosthesis; simulation; wayfinding; mobility; orientation
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Funding
- NIH [EY07143-11 (LW), EY12843 (GD)]
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Purpose. To assess virtual maze navigation performance with simulated prosthetic vision in gaze-locked viewing, under the conditions of varying luminance contrast, background noise, and phosphene dropout. Methods. Four normally sighted subjects performed virtual maze navigation using simulated prosthetic vision in gaze-locked viewing, under five conditions of luminance contrast, background noise, and phosphene dropout. Navigation performance was measured as the time required to traverse a 10-room maze using a game controller, and the number of errors made during the trip. Results. Navigation performance time (1) became stable after 6 to 10 trials, (2) remained similar on average at luminance contrast of 68% and 16% but had greater variation at 16%, (3) was not significantly affected by background noise, and (4) increased by 40% when 30% of phosphenes were removed. Navigation performance time and number of errors were significantly and positively correlated., Conclusions. Assuming that the simulated gaze-locked viewing conditions are extended to implant wearers, such prosthetic vision can be helpful for wayfinding in simple mobility tasks, though phosphene dropout may interfere with performance.
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