US 11,717,156 B2
Eye tracking fixation monitoring systems and methods
Sascha Birkner, Berlin (DE); and Martin Gründig, Rangsdorf (DE)
Assigned to Alcon Inc., Fribourg (CH)
Filed by Alcon Inc., Fribourg (CH)
Filed on Aug. 12, 2020, as Appl. No. 16/991,937.
Claims priority of provisional application 62/886,517, filed on Aug. 14, 2019.
Prior Publication US 2021/0045631 A1, Feb. 18, 2021
Int. Cl. A61B 3/113 (2006.01); G06T 7/73 (2017.01); G06T 7/246 (2017.01); A61B 3/00 (2006.01); A61B 3/10 (2006.01); A61B 3/12 (2006.01); A61B 3/14 (2006.01); A61B 3/18 (2006.01); G06T 7/00 (2017.01); G06V 40/19 (2022.01)
CPC A61B 3/113 (2013.01) [A61B 3/0025 (2013.01); A61B 3/102 (2013.01); A61B 3/1225 (2013.01); A61B 3/14 (2013.01); A61B 3/18 (2013.01); G06T 7/0016 (2013.01); G06T 7/248 (2017.01); G06T 7/74 (2017.01); G06V 40/19 (2022.01); G06T 2207/10101 (2013.01); G06T 2207/30041 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A system comprising:
an eye tracker configured to capture a first plurality of images of an eye; and
a control processor configured to:
detect an eye position and orientation in each of the first plurality of images;
determine an eye fixation position and orientation relative to an optical axis of the eye tracker;
estimate eye fixation parameters based at least in part on the determined eye fixation position and orientation;
track the eye position and orientation by analyzing one or more images from the first plurality of images to determine the eye position and orientation relative to the eye fixation parameters; and
detect the fixation position relative to the optical axis of the eye tracker by constructing and analyzing a histogram of detected eye positions and orientations.