1. An eye tracking device to be used in a head-worn augmented reality device, comprising: a plurality of light sources to emit light, wherein the plurality of light sources are positioned in a manner such that a user's eye is illuminated; one or more sensors to detect one or more characteristics pertaining to an interaction of the light from the plurality of light sources and the user's eyes; and a processor to determine a movement of the user's eyes based at least in part on the detected one or more characteristics.