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June 13, 2010

Mtg: Optoelectronic Retinal Prosthesis for Restoration of Sight to the Blind

by @ 11:52 am. Filed under ALL, BioEngineering, Electronics Design, Engineering Mgmt

WEDNESDAY June 16, 2010
SCV Engineering in Medicine and Biology Chapter
Speaker: Daniel Palanker, Department of Ophthalmology and Hansen Experimental Physics Laboratory, Stanford University
Time: Optional dinner: Nexus Cafeteria 6:15 PM; Presentation at 7:30 PM
Cost: none, for talk
Place: Room M-114, Stanford University Medical School, Stanford
RSVP: not required

Retinal degeneration leads to blindness due to loss of photoreceptors, while the inner retinal neurons are often preserved to large extent. Visual information can be reintroduced into the visual system by electrical stimulation of the remaining retinal circuitry using implanted microelectrode array.? In our prosthetic system the processed images of the visual scene captured by the camera are projected from the micro LCD display mounted in the video goggles onto a subretinally implanted microphotodiode array.? Each photovoltaic pixel in the array converts the received pulsed near-infrared light (900 nm) into biphasic pulses of electric current that directly stimulate retinal neurons.? In this approach thousands of pixels in the implant can be activated simultaneously and independently, and a natural link between the eye movements and image perception is preserved.
3-dimensional implant structure facilitates close integration of neurons with stimulating electrodes, and modular design of the implant allows for expansion of the stimulated field.? I will describe the current status of the system development and testing, and the resolution limits attainable with such technology.

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