Patent ID: 8740385

Claim:
A method for tracking an eye, the method comprising: obtaining a first image of the eye; processing the first image of the eye so as to identify an iris image; processing the first iris image so as to identify a plurality of natural tissue markers separated across the iris image; processing a second image of the eye so as to identify at least one of the plurality of markers within the second image; determining a rotational offset between the first image of the eye and the second image of the eye using the identified markers; and processing a third image of the eye after determining the rotational offset between the first image of the eye and the second image of the eye, and wherein the third image is processed so as to identify: (1) at least one of the previously identified plurality of markers, (2) a previously unidentified natural tissue marker, or (3) an artificial landmark within the third image tracking the eye using the tissue marker or landmark identified by processing the third image.