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Illustration of electric potential with 55 μm-pixel implants using a previously described model [27], plotted over a histological image of the rat retina. (a) With flat pixels, the top cells in the inner nuclear layer (INL) are not stimulated. (b) By elevating the active electrode [1] halfway into the INL, electric field can penetrate deeper into the INL. Return electrode [2] remains on the surface of the device.
