US Patent 11579690 Gaze tracking apparatus and systems

A system configured to perform an eye tracking process using a head-mountable eye-tracking arrangement, the system comprising an eye tracking unit, located on the head-mountable arrangement, operable to detect motion of one or both of the user's eyes, a relative motion identification unit operable to identify motion of the head-mountable arrangement relative to the user's head, and a correction unit operable to determine a correction to the eye tracking process in dependence upon the identified motion of the user's head relative to the head-mountable arrangement.