An integrated device for improving the visual system of a human subject includes a computer having a timer and in data communication with a display, a current source and a housing that contains the current source in addition to at least one of the display and the computer. The computer and display are adapted to present optical stimuli to a targeted region of an eye. The current source has at least one terminal for connection of at least one electrode assembly. The timer measures a time relationship. The current source provides electrical stimulation to the subject's brain and the display provides optical stimulation to the subject's eye in a time relationship determined by the timer
