Method of making a flexible circuit electrode array

A method of making a flexible circuit electrode array comprising:

• providing a substrate;
• depositing a polymer base layer on the substrate;
• depositing a first metal layer on said polymer base layer;
• patterning said first metal to form first metal traces, electrodes and bond pads;
• depositing a polymer interlayer on said polymer base layer and said first metal traces, electrodes and bond pads;
• patterning said polymer interlayer to provide vias;
• depositing a second metal layer on said polymer interlayer filling said vias;
• patterning said second metal layer to form second metal traces, electrodes and bond pads;
• depositing a polymer top layer on said polymer interlayer and said second metal traces, electrodes and bond pads;
• patterning said polymer top layer to provide openings for exposing the second electrodes and bond pads, thus forming a flexible circuit electrode array;
• removing said flexible circuit from the substrate;
• and
• embedding a portion of the flexible circuit electrode array including electrodes in an curved body having a generally convex curved surface in the plane of a retina, the curved body curved to conform to a spherical curvature of the retina.