US 11,779,208 B2
Tracking movement of an eye within a tracking range
Jessica Jurich, Berlin (DE); Horia Grecu, Berlin (DE); Martin Gründig, Rangsdorf (DE); and Tobias Jura Rapoport, Berlin (DE)
Assigned to Alcon Inc., Fribourg (CH)
Filed by Alcon Inc., Fribourg (CH)
Filed on Feb. 18, 2022, as Appl. No. 17/675,383.
Application 17/675,383 is a continuation of application No. 16/139,151, filed on Sep. 24, 2018, granted, now 11,284,794.
Claims priority of provisional application 62/568,969, filed on Oct. 6, 2017.
Prior Publication US 2022/0167844 A1, Jun. 2, 2022
Int. Cl. A61B 3/113 (2006.01); A61B 3/00 (2006.01); A61F 9/008 (2006.01)
CPC A61B 3/113 (2013.01) [A61B 3/0025 (2013.01); A61F 9/008 (2013.01); A61F 2009/00846 (2013.01); A61F 2009/00897 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A system for tracking movement of an eye, comprising:
a camera system configured to generate a plurality of images of the eye;
a computer system comprising:
a memory configured to store the plurality of images and store at least one of the images as a reference image; and
one or more processors configured to:
track movement of the eye within a tracking range by comparing a current image of the plurality of images with the reference image, and by determining a rotational movement of the eye from the comparison of the current image and the reference image, the tracking range having a plurality of alert points comprising a tracking boundary point and an intermediate point, the tracking boundary point representing a maximum number of degrees away from a zero point where tracking can be properly performed, the intermediate point located between the zero point and the tracking boundary point; and
determine an orientation of the eye relative to at least one alert point of the tracking range; and
an output device configured to output a range indicator that indicates the orientation of the eye relative to the at least one alert point of the tracking range, the output device comprising a speaker that outputs the range indicator as:
a first sound if the orientation of the eye corresponds to a point between the intermediate point and the tracking boundary point indicating the eye is nearing a tracking boundary beyond which tracking cannot be performed; and
a second sound different from the first sound if the orientation of the eye corresponds to a point beyond the tracking boundary point where tracking cannot be performed.