Patent ID: 8550628
Filing Date: 2013-10-08
Classification: G03B

Abstract:
1. An eye tracking apparatus for monitoring the movement of a user's eye, the apparatus comprising: a) a display for displaying an image, b) an eye imaging sensor for monitoring the user's eye and for providing an output indicative of the user's point of regard in the user's field of vision, c) an optical combiner, in optical communication with the display, the eye imaging sensor; said optical combiner arranged to receive the displayed image from the display, to project said image into the user's field of vision, to receive electromagnetic radiation reflected from the user's eye and to pass said reflected radiation to the eye imaging sensor, wherein the optical combiner is adapted to substantially correct for aberrations in the reflected radiation introduced therein by the optical combiner, and the optical combiner has a coating on a rear face thereof that is substantially reflective at visible wavelengths but substantially transmissive at wavelengths to which the eye imaging sensor is sensitive.