1. A method for tracking a user's eye gaze at a surface, object, or visual scene, comprising: providing an imaging device for acquiring images of at least one of the user's eyes; modeling, measuring, estimating, and/or calibrating for the user's head position; providing one or more markers associated with the surface, object, or visual scene for producing corresponding glints or reflections in the user's eyes; analyzing the images to find said glints or reflections and/or the pupil; and determining eye gaze of the user upon a said one or more marker without calibration relative to a said one or more marker, as indicative of the user's eye gaze at the surface, object, or visual scene.