Towards accurate camera-less eye tracker using instrumented contact lens

This paper presents a camera-less eye tracker. Composed of 2 parts, an instrumented contact lens and spectacles, its principle consists in computing a barycenter based on the light intensity variations received from the spectacles onto the lens. To demonstrate both the method and the achieved accuracy it yields, a prototype lens fitted with 4 infrared sensors has been fabricated and tested. Based on measured photo-currents, simulations, both behavioral and at transistor level (AMS 0.35 µm CMOS), show an accuracy of 0.1° can be achieved. Which is a significant improvement to the 1° camera-base eye trackers offer.