High resolution optoelectronic retinal prosthesis

Jim Loudin; Rostam Dinyari; Phil Huie; Alex Butterwick; Peter Peumans; Daniel Palanker

doi:10.1117/12.807668

18 February 2009 High resolution optoelectronic retinal prosthesis

Jim Loudin, Rostam Dinyari, Phil Huie, Alex Butterwick, Peter Peumans, Daniel Palanker

Proceedings Volume 7163, Ophthalmic Technologies XIX; 71631B (2009) https://doi.org/10.1117/12.807668
Event: SPIE BiOS, 2009, San Jose, California, United States

Abstract

Electronic retinal prostheses seek to restore sight in patients with retinal degeneration by delivering pulsed electric currents to retinal neurons via an array of microelectrodes. Most implants use inductive or optical transmission of information and power to an intraocular receiver, with decoded signals subsequently distributed to retinal electrodes through an intraocular cable. Surgical complexity could be minimized by an "integrated" prosthesis, in which both power and data are delivered directly to the stimulating array without any discrete components or cables. We present here an integrated retinal prosthesis system based on a photodiode array implant. Video frames are processed and imaged onto the retinal implant by a video goggle projection system operating at near-infrared wavelengths (~ 900 nm). Photodiodes convert light into pulsed electric current, with charge injection maximized by specially optimized series photodiode circuits. Prostheses of three different pixel densities (16 pix/mm², 64 pix/mm², and 256 pix/mm²) have been designed, simulated, and prototyped. Retinal tissue response to subretinal implants made of various materials has been investigated in RCS rats. The resulting prosthesis can provide sufficient charge injection for high resolution retinal stimulation without the need for implantation of any bulky discrete elements such as coils or tethers. In addition, since every pixel functions independently, pixel arrays may be placed separately in the subretinal space, providing visual stimulation to a larger field of view.

Citation Download Citation

Jim Loudin, Rostam Dinyari, Phil Huie, Alex Butterwick, Peter Peumans, and Daniel Palanker "High resolution optoelectronic retinal prosthesis", Proc. SPIE 7163, Ophthalmic Technologies XIX, 71631B (18 February 2009); https://doi.org/10.1117/12.807668

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