Patent ID: 9568603
Date: 2017-02-14
CPC Classifications: A61B,G01S,G02B,G02C,G06F,G06K,H04N

Claim:
1. A method of tracking eye movement, the method comprising: transmitting only infrared light, from a first source mounted on eyeglasses worn by a person, so that at least a first portion of the transmitted infrared light is reflected off an inner surface of a lens of the eyeglasses and subsequently reflected off an eye of the person, and at least a second portion of the transmitted infrared light is transmitted through the lens to reflect off objects in an environment in which the person is located; detecting, by a sensor mounted on the eyeglasses worn by the person, reflections of both the first portion transmitted infrared light reflected off the eye of the person and the second portion of the transmitted infrared light reflected off objects in the environment; determining corresponding times of flight of the detected reflections of the first and second portions of the transmitted light; filtering out detected reflections of the second portion of the transmitted infrared light based on times of flight of the detected reflections of the first and second portions of the transmitted infrared light; filtering out ambient infrared light from light detected by the sensor; and tracking positions of the eye based on filtered outputs of the sensor, by using the detected reflections of the first portion of the transmitted infrared light.