Electrical stimulation of retina in blind humans

Author

Weiland, J.D. ; Yanai, D. ; Mahadevappa, M. ; Williamson, R. ; Mech, B.V. ; Fujii, G.Y. ; Little, J. ; Greenberg, R.J. ; De Juan, E., Jr. ; Humayun, M.S.

Author_Institution

Dept. of Ophthalmology, Southern California Univ., Los Angeles, CA, USA

Volume

3

fYear

2003

fDate

17-21 Sept. 2003

Firstpage

2021

Abstract

A prototype electronic retinal prosthesis has been tested in two subjects. The system features an implanted retinal stimulator and an external system for image acquisition, processing, and telemetry. Subjects can perceive light when each of the 16 electrodes were activated. Stimulus thresholds ranged from 28 to 1417 μA. Strength duration curves were obtained in all two subjects. Dynamic range for the brightness of the stimulus was demonstrated. Using the camera, the subjects were able to locate objects and determine the direction of movement.

Keywords

biomedical electrodes; brightness; eye; neuromuscular stimulation; prosthetics; 28 to 1417 muA; blind humans; brightness; dynamic range; electrical stimulation; electrodes; image acquisition; image processing; implanted retinal stimulator; light perception; prototype electronic retinal prosthesis; retina; telemetry; Brightness; Dynamic range; Electrical stimulation; Electrodes; Electronic equipment testing; Humans; Prosthetics; Prototypes; Retina; Telemetry;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering in Medicine and Biology Society, 2003. Proceedings of the 25th Annual International Conference of the IEEE

ISSN

1094-687X

Print_ISBN

0-7803-7789-3

Type

conf

DOI

10.1109/IEMBS.2003.1280131

Filename

1280131