Patent ID: 8239033

Claim:
A method for stimulating a subject's retina, the method comprising: selecting at least a first and a second electrode within a two dimensional array of electrodes, each electrode configured to apply current to the subject's retina; determining a maximum effective impedance; determining impedance for the at least first electrode and second electrode; detecting a video image; applying current to the subject's retina through the at least first and second electrode, provided the impedance for the at least first electrode and second electrode does not exceed the maximum effective impedance, wherein current to be applied by the first electrode and the second electrode is configured to be calculated from said video image and said impedance, and wherein, for a given luminance in said video image, current is higher for the first electrode when the first electrode has an impedance lower than impedance of the second electrode; and providing a visual user interface configured to show impedance values of the electrodes in a grid corresponding to the two dimensional array of electrodes and configured to provide manual adjustment of current on each electrode, wherein the grid indicates status of each electrode in the two dimensional array of electrodes using a status symbol for each electrode, the status being selected from the group including an operational state, a broken state, a shorted state, and a deselected state.