Title :
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
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;
Conference_Titel :
Engineering in Medicine and Biology Society, 2003. Proceedings of the 25th Annual International Conference of the IEEE
Print_ISBN :
0-7803-7789-3
DOI :
10.1109/IEMBS.2003.1280131
