METHOD AND APPARATUS FOR CALIBRATION-FREE EYE TRACKING

A method and apparatus for eye gaze tracking in human or animal subjects without calibration of cameras, specific measurements of eye geometries, or tracking of a cursor image on a screen by the subject through a known trajectory. One embodiment provides 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 eves: 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 as indicative of the user's eye gaze at the surface, object, or visual scene.