US 12,213,917 B2
High speed tracking of IOL during refractive index modification
David A. Dewey, Sunnyvale, CA (US); Michael Wiltberger, Santa Clara, CA (US); Phillip Gooding, Mountain View, CA (US); and Georg Schuele, Portola Valley, CA (US)
Assigned to AMO Development, LLC, Irvine, CA (US)
Filed by AMO Development, LLC, Irvine, CA (US)
Filed on Dec. 12, 2022, as Appl. No. 18/064,848.
Application 18/064,848 is a continuation of application No. 17/057,686, granted, now 11,534,339, previously published as PCT/IB2020/053420, filed on Apr. 9, 2020.
Claims priority of provisional application 62/944,335, filed on Dec. 5, 2019.
Claims priority of provisional application 62/832,836, filed on Apr. 11, 2019.
Prior Publication US 2023/0111508 A1, Apr. 13, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. A61F 9/008 (2006.01); G16H 30/40 (2018.01)
CPC A61F 9/00834 (2013.01) [G16H 30/40 (2018.01); A61F 2009/00842 (2013.01); A61F 2009/00846 (2013.01); A61F 2009/0087 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A process of modifying an intraocular lens (IOL) implanted in a patient's eye using an ophthalmic laser system, comprising:
delivering a laser beam into the IOL to modify a refractive property of the IOL;
simultaneously monitoring a position of the IOL within the eye, which includes:
operating a video camera to acquire an image of a field of view containing the IOL;
performing a contrast analysis on the image to locate a high contrast fiducial of the IOL, the fiducial being located away from an edge of the IOL;
obtaining a reference area of interest (AOI) from the image, the reference AOI being centered around the fiducial and containing a predefined number of video camera scan line segments with a predefined number of pixels per scan line segment, a size of the reference AOI being smaller than a size of the IOL as defined by an outline of the edge of the IOL;
operating the video camera to obtain multiple successive AOIs from successive images, each AOI containing the predefined number of video camera scan line segments with the predefined number of pixels per scan line segment; and
analyzing each of the multiple successive AOIs, without analyzing any image portions of the successive images other than the AOI, to determine a direction and magnitude of movement of the fiducial; and
controlling delivery of the laser beam into the IOL based on the direction and/or magnitude of movement of the fiducial.