1. A stimulation system for a visual prosthesis generating a stimulation signal to precondition an electrode-tissue interface, comprising: a computer; an implanted neural-stimulator, including a plurality of electrodes suitable to contact neural tissue; a video processing unit in communication with the computer and the implanted neural stimulator; and software, loaded in the computer, adapted to instruct the implanted neural stimulator through the video processing unit to deliver a first small electrical charge causing a non-faradaic reaction in the electrode tissue interface, including charge balanced biphasic square wave current pulses, for a predetermined duration of 1 second to 10 minutes, to deliver a second electrical charge within a predetermined delay of the predetermined duration and measure impedance after delivering the second electrical charge, and then to perform a stimulating method for a visual prosthesis having a plurality of electrodes.