US 12,449,654 B2
Eye tracking systems and methods
Boris Greenberg, Tel Aviv (IL); Abraham Rotnemer, Jerusalem (IL); Shoam Shwartz, Hod Hasharon (IL); Fares Marjieh, Jaffa-Nazareth (IL); Yaron Zimmerman, Kiryat Tivon (IL); Igor Tikhonenkov, Kiriat Mozkin (IL); and Hanna Friedman, Givat Zeev (IL)
Assigned to VOXELSENSORS SRL, Brussels (BE)
Appl. No. 17/783,747
Filed by EYEWAY VISION LTD., Or Yehuda (IL)
PCT Filed Dec. 6, 2020, PCT No. PCT/IL2020/051255
§ 371(c)(1), (2) Date Jun. 9, 2022,
PCT Pub. No. WO2021/117031, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 271287 (IL), filed on Dec. 9, 2019.
Prior Publication US 2023/0039271 A1, Feb. 9, 2023
Int. Cl. G02B 27/00 (2006.01); G06F 3/01 (2006.01)
CPC G02B 27/0093 (2013.01) [G06F 3/013 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A method for tracking an ocular axis of an individual's eye, the method comprising:
(i) illuminating an eye of an individual, over an area of cornea of the eye extending over pupil of the eye, with first and second incident light beams having a transverse cross sectional area smaller than an area of the pupil and propagating towards the eye coaxially along a first optical path defined by central axes of the first and second incident light beams, said first and second incident light beams differing from one another in at least one of optical properties and timing parameters, thereby enabling to identify first and second reflected light beams comprising reflections of said first and second incident light beams propagating backwardly from the cornea and a retina region of the eye;
(ii) detecting said first and second reflected light beams and generating a detection output indicative thereof, said detection output being indicative of changes in spatial and angular propagation paths of the first and second reflected light beams, said changes being indicative of a change in at least one of spatial and angular positions of said ocular axis
(iii) adjusting the first optical path such that said first reflected light beam propagates backwardly from the eye along said first optical path and said second reflected light beam propagates backwardly from the eye along a second optical path having a predetermined spatial relationship with said first optical path whereby said predetermined spatial relationship is indicative of said ocular axis being along at least said first optical path; and
(iv) tracking said ocular axis of the eye under changes in gaze direction of said eye by repeating (i) to (iii).