Journal article

Global activity shaping strategies for a retinal implant

Martin J Spencer, Tatiana Kameneva, David B Grayden, Hamish Meffin, Anthony N Burkitt

Journal of Neural Engineering | IOP Publishing | Published : 2019

Abstract

Objective. Retinal prostheses provide visual perception via electrical stimulation of the retina using an implanted array of electrodes. The retinal activation resulting from each electrode is not point-like; instead each electrode introduces a spread of retinal activation that may overlap with activations from other electrodes. With most conventional stimulation strategies this overlap leads to image blur. Here we propose a 'shaping' algorithm that uses multiple electrodes to manipulate the current between electrodes in a desired way. Approach. We assume a forward model for the conversion of electrode strengths to retinal activation. Three alternative global shaping algorithms are developed..

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