1. A system for improving signal-to-noise ratio for an eye gaze tracker, comprising: an illuminator for illuminating a user's eye with light radiation; a camera for detecting an illuminator signal from said illuminator light radiation reflected from the user's eye and also detecting ambient light noise, said camera outputting an output signal; means for synchronizing said illuminator to turn on with a first interval of said camera and turn off with a second interval of said camera; means for digitizing said output signal and capturing a first image from said first interval having an illuminator signal portion and an ambient light noise portion and capturing a second image from said second interval having said ambient light noise portion; and means for subtracting said first image from said second image to produce an output image substantially devoid of said ambient light noise portion.