NDLI: Retinal prosthesis phosphene shape analysis

Content Provider	IEEE Xplore Digital Library
Author	Nanduri, D. Humayun, M.S. Greenberg, R.J. McMahon, M.J. Weiland, J.D.
Copyright Year	2008
Description	Author affiliation: Department of Biomedical Engineering at the University of Southern California, Los Angeles, 90033 USA (Nanduri, D.) \|\| Department of Biomedical Engineering and Department of Ophthalmology at the University of Southern California, Los Angeles, 90033 USA (Humayun, M.S.; Weiland, J.D.) \|\| Second Sight Medical Products Inc. in Sylmar, CA 91342 USA (Greenberg, R.J.; McMahon, M.J.)
Abstract	A retinal prosthesis system to restore sight for the blind is under development. The system is analogous to cochlear implants, in which photoreceptor input is bypassed and replaced by direct electrical stimulation of the retinal ganglion cells. Currently, six test subjects have been implanted with a 4×4 electrode array and stimulator. We report here psychophysical clinical data examining how stimulation amplitude affects phosphene shape and repeatability on a single electrode. Phosphene shape data was quantified by a set of numerical descriptors calculated from image moments. Comparison of phosphene descriptors for a single electrode across repeated trials and amplitude levels measured the repeatability within an amplitude group. Our experimental findings show that stimulation of the retina creates repeatable percept shapes and that an increase in stimulation amplitude causes a significant change in size and shape of phosphenes.
Starting Page	1785
Ending Page	1788
File Size	289718
Page Count	4
File Format	PDF
ISBN	9781424418145
ISSN	1557170X
DOI	10.1109/IEMBS.2008.4649524
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-08-20
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Content Type	Text
Resource Type	Article
Subject	Signal Processing Biomedical Engineering Health Informatics Computer Vision and Pattern Recognition

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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