1. An eye tracking system comprising: a horizontal line camera configured to capture a horizontal image of at least a portion of the eye and to provide an output signal representing the horizontal image of the eye; a vertical line camera configured to capture a vertical image of at least a portion of the eye and to provide an output signal representing the vertical image of the eye; a processor, coupled to the horizontal line camera and the vertical line camera to process the signals representing the horizontal and vertical images of the eye to identify and track motion of the eye.