An embodiment of the present invention is a system for identifying a user by observing irregularities on the surface of an eyeball of the user includes a topography system and a gaze tracking system. The topography system obtains one or more discernable features of the eyeball and stores the one or more...http://www.google.com/patents/US20060210122?utm_source=gb-gplus-sharePatent US20060210122 - System and method for eyeball surface topography as a biometric discriminator
