Methods and systems for determining change in eye position between successive eye measurements

    公开(公告)号:US11963722B2

    公开(公告)日:2024-04-23

    申请号:US17229789

    申请日:2021-04-13

    CPC classification number: A61B3/113 A61B3/0025 A61B3/102

    Abstract: A measurement instrument and method: produce light having a linear shape; direct the light toward an eye via a first lens located one focal length from the light source; provide returned light, having the linear shape, from the eye to a split-prism; split the returned light into first and second linear segments; image the first and second linear segments onto an image sensor; determine a first lateral offset between the first and second linear segments on the image sensor at a first time; determine a second lateral offset between the first and second linear segments on the image sensor at a second time; determine a difference between the first and second lateral offsets; and determine a distance that the eye moved relative to the first lens between the first time and the second time based on the difference between the first and second lateral offsets.

    Methods and systems for optical coherence tomography scanning of cornea and retina

    公开(公告)号:US11730361B2

    公开(公告)日:2023-08-22

    申请号:US17246507

    申请日:2021-04-30

    Abstract: An instrument includes: one or more scanning mirrors to receive an OCT sample beam and to scan the sample beam in two orthogonal directions; and an optical system to receive the sample beam and provide the sample beam to an eye. The optical system includes: a first lens having a first focal length, disposed along an optical path from the scanning mirror(s) to the eye at a distance from the cornea which is approximately equal to the first focal length, and a second lens disposed along the optical path between the first lens and the scanning mirror(s). The second lens receives the sample beam from the scanning mirror(s) and provides the sample beam to the first lens as a converging beam such that, as the sample beam is scanned, the sample beam passes through a pivot point located along an optical axis between the eye and the first lens.

    OPTICAL MEASUREMENT SYSTEMS AND PROCESSES WITH FIXATION TARGET HAVING BOKEH COMPENSATION

    公开(公告)号:US20210196113A1

    公开(公告)日:2021-07-01

    申请号:US17102365

    申请日:2020-11-23

    Abstract: A system includes: at least one processor; a movable stage, wherein the movable stage is movable under control of the at least one processor with respect to an eye of a subject; a video display device configured to move with the movable stage; and an optical system disposed in an optical path between the video display device and the eye. The video display device is configured to play a movie of a fixation target to the eye to cause the eye to accommodate, and the movie dynamically changes an appearance of the fixation target on the video display device to compensate for Bokeh of the fixation target as the movable stage moves the video display device from a first position, where the fixation target draws a focus of the eye to near its far point, to a second position further away from the eye than the first position.

    Optical measurement system and method including blink rate monitor and/or tear film breakup detector

    公开(公告)号:US10952606B2

    公开(公告)日:2021-03-23

    申请号:US16156956

    申请日:2018-10-10

    Abstract: An optical measurement system and method measure a characteristic of a subject's eye. The optical measurement system receives from an operator, via a user interface of the optical measurement instrument, a begin measurement instruction indicating the start of a measurement period for objectively measuring at least one characteristic of the subject's eye. Subsequent to receiving the begin measurement instruction, the optical measurement system determines whether a criterion associated with the tear film quality of the subject's eye is not satisfied. In response to determining that the criterion is not satisfied, the optical measurement instrument takes one or more corrective actions to measure the characteristic of the subject's eye under a condition wherein the criterion is satisfied.

    METHOD AND SYSTEM FOR PUPIL RETRO ILLUMINATION USING SAMPLE ARM OF OCT INTERFEROMETER

    公开(公告)号:US20210076935A1

    公开(公告)日:2021-03-18

    申请号:US17103849

    申请日:2020-11-24

    Abstract: An optical measurement instrument includes optical coherence tomography (OCT) interferometer and a pupil retro illumination system which directs laser light onto the retina of an eye via the sample arm of the OCT interferometer. The laser light passes through an intraocular lens (IOL) implanted into the eye, and an iris camera captures an image of the eye from a portion of the light returned from the retina of the eye, the returned light also passing through the IOL. One or more fiducials of the IOL are detected from the captured image, and an angular orientation of the eye is ascertained from the one or more detected fiducials.

    Optical measurement systems and processes with fixation target having Bokeh compensation

    公开(公告)号:US11896305B2

    公开(公告)日:2024-02-13

    申请号:US17102365

    申请日:2020-11-23

    Abstract: A system includes: at least one processor; a movable stage, wherein the movable stage is movable under control of the at least one processor with respect to an eye of a subject; a video display device configured to move with the movable stage; and an optical system disposed in an optical path between the video display device and the eye. The video display device is configured to play a movie of a fixation target to the eye to cause the eye to accommodate, and the movie dynamically changes an appearance of the fixation target on the video display device to compensate for Bokeh of the fixation target as the movable stage moves the video display device from a first position, where the fixation target draws a focus of the eye to near its far point, to a second position further away from the eye than the first position.

    METHODS AND SYSTEMS FOR OPTICAL COHERENCE TOMOGRAPHY SCANNING OF CORNEA AND RETINA

    公开(公告)号:US20210338075A1

    公开(公告)日:2021-11-04

    申请号:US17246507

    申请日:2021-04-30

    Abstract: An instrument includes: one or more scanning mirrors to receive an OCT sample beam and to scan the sample beam in two orthogonal directions; and an optical system to receive the sample beam and provide the sample beam to an eye. The optical system includes: a first lens having a first focal length, disposed along an optical path from the scanning mirror(s) to the eye at a distance from the cornea which is approximately equal to the first focal length, and a second lens disposed along the optical path between the first lens and the scanning mirror(s). The second lens receives the sample beam from the scanning mirror(s) and provides the sample beam to the first lens as a converging beam such that, as the sample beam is scanned, the sample beam passes through a pivot point located along an optical axis between the eye and the first lens.

    OPTICAL MEASUREMENT SYSTEMS AND PROCESSES WITH FIXATION TARGET HAVING CYLINDER COMPENSATION

    公开(公告)号:US20210186321A1

    公开(公告)日:2021-06-24

    申请号:US17102413

    申请日:2020-11-23

    Abstract: A system includes: a first movable stage which is movable with respect to an eye of a subject; a second movable stage mounted on the first movable stage, wherein the second movable stage is movable with respect to the first movable stage; a fixation target disposed on the second movable stage; and an optical system disposed in an optical path between the fixation target and the eye, wherein the optical system is configured for projecting the fixation target upon the eye to accommodate the eye. The optical system includes a Stokes cell in the optical path between the fixation target and the eye. The optical system non-telecentrically projects the fixation target upon the eye.

    Methods and systems of optical coherence tomography with fiducial signal for correcting scanning laser nonlinearity

    公开(公告)号:US11026575B2

    公开(公告)日:2021-06-08

    申请号:US16253098

    申请日:2019-01-21

    Abstract: A system includes: a swept laser light source generating laser light having a frequency swept across a frequency bandwidth as a function of time; a sample path directing a first portion of the laser light to an eye as a probe beam and receiving a returned portion of the probe beam from the eye; a reference path passing therethrough a second portion of the laser light, the reference path having a defined optical path length; and a detector receiving the returned portion of the probe beam from the eye and the second portion of the laser light from the reference path, and in response thereto outputting an optical coherence tomography (OCT) output signal having OCT peaks whose relative timing represents the depths of surfaces of structures of the eye, wherein the sample path includes a fiducial generator which produces a fiducial peak in the OCT output signal.

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