1. A gaze tracking system comprising: an optical module disposed to receive, from a target, illumination including an ambient light component and a controlled light component, and provide a background output and a tracking output, said background output consisting substantially of the ambient light component and said tracking output including the ambient light component and the controlled light component; an imaging module disposed to receive the tracking output and the background output and provide a set of images based on the tracking output and background output wherein the set of images provided by the imaging module include a set of background channel images based on the background output and a set of tracking channel images based on the tracking output and wherein a plurality of images of the set of background channel images and a corresponding plurality of images of the set of tracking channel images are captured simultaneously; and a processor module disposed to: receive the set of images; provide, based on the set of images, gaze tracking data; and store, in a processor readable memory, the gaze tracking data.