Daniel Palanker and his group at Stanford University have developed an optoelectronic system for visual prosthesis [8] that includes a subretinal photodiode array and an infrared image projection system mounted on video goggles. Information from the video camera is processed in a pocket PC and displayed on pulsed near-infrared (IR, 850-900 nm) video goggles. IR image is projected onto the retina via natural eye optics, and activates photodiodes in the subretinal implant that convert light into pulsed bi-phasic electric current in each pixel. Charge injection can be further increased using a common bias voltage provided by a radiofrequency-driven implantable power supply [9] Proximity between electrodes and neural cells necessary for high resolution stimulation can be achieved utilizing effect of retinal migration.
Tuesday, March 31, 2020
Optoelectronic Retinal Prosthesis
Daniel Palanker and his group at Stanford University have developed an optoelectronic system for visual prosthesis [8] that includes a subretinal photodiode array and an infrared image projection system mounted on video goggles. Information from the video camera is processed in a pocket PC and displayed on pulsed near-infrared (IR, 850-900 nm) video goggles. IR image is projected onto the retina via natural eye optics, and activates photodiodes in the subretinal implant that convert light into pulsed bi-phasic electric current in each pixel. Charge injection can be further increased using a common bias voltage provided by a radiofrequency-driven implantable power supply [9] Proximity between electrodes and neural cells necessary for high resolution stimulation can be achieved utilizing effect of retinal migration.
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