Optical surface identification for laser eye surgery
First Claim
1. A laser eye surgery system, comprising:
- a cutting laser subsystem configured to generate a pulsed laser beam;
an optical system, including at least an objective lens, configured to direct the pulsed laser beam to an eye of a patient;
an optical coherence tomography (OCT) imaging subsystem configured to generate an OCT sample beam and an OCT reference beam, the OCT imaging subsystem including an adjustable reference path length along which the OCT reference beam is propagated and wherein the optical system is further configured to direct the OCT sample beam to a target which includes the eye of the patient and direct reflected sample light from the target to return to the OCT subsystem, the OCT sample beam and the OCT reference beam having a plurality of wavelengths such that the OCT imaging subsystem generates an A-scan based on the reference beam and the returned sample beam, the A-scan representing measurement data within a detection window which spans a range of distances relative to the objective lens, a depth location of the detection window being dependent on the reference path length; and
control electronics operably connected to the cutting laser subsystem and the OCT imaging subsystem, the control electronics being programmed;
to cause the OCT imaging subsystem to adjust the reference path length to a plurality of values and to generate a corresponding plurality of A-scans, and to cause the optical system to deliver the OCT sample beam to the target at different transverse locations for the different A-scans, wherein the plurality of A-scans are arranged in one or more spiral patterns, and wherein the plurality of values of the reference path length are selected so that the plurality of A-scans span a depth range encompassing an expected variability of distance from the objective lens to a feature of the target;
to process the plurality of A-scans to locate, relative to the objective lens, the corneal anterior surface, the lens capsule anterior surface, or the lens capsule posterior surface; and
to control the cutting laser subsystem to generate the pulsed laser beam to be directed to the located corneal anterior surface, lens capsule anterior surface, or lens capsule posterior surface.
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Accused Products
Abstract
Systems and methods automatically locate optical surfaces of an eye and automatically generate surface models of the optical surfaces. A method includes OCT scanning of an eye. Returning portions of a sample beam are processed to locate a point on the optical surface and first locations on the optical surface within a first radial distance of the point. A first surface model of the optical surface is generated based on the location of the point and the first locations. Returning portions of the sample beam are processed so as to detect second locations on the optical surface beyond the first radial distance and within a second radial distance from the point. A second surface model of the optical surface is generated based on the location of the point on the optical surface and the first and second locations on the optical surface.
67 Citations
17 Claims
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1. A laser eye surgery system, comprising:
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a cutting laser subsystem configured to generate a pulsed laser beam; an optical system, including at least an objective lens, configured to direct the pulsed laser beam to an eye of a patient; an optical coherence tomography (OCT) imaging subsystem configured to generate an OCT sample beam and an OCT reference beam, the OCT imaging subsystem including an adjustable reference path length along which the OCT reference beam is propagated and wherein the optical system is further configured to direct the OCT sample beam to a target which includes the eye of the patient and direct reflected sample light from the target to return to the OCT subsystem, the OCT sample beam and the OCT reference beam having a plurality of wavelengths such that the OCT imaging subsystem generates an A-scan based on the reference beam and the returned sample beam, the A-scan representing measurement data within a detection window which spans a range of distances relative to the objective lens, a depth location of the detection window being dependent on the reference path length; and control electronics operably connected to the cutting laser subsystem and the OCT imaging subsystem, the control electronics being programmed; to cause the OCT imaging subsystem to adjust the reference path length to a plurality of values and to generate a corresponding plurality of A-scans, and to cause the optical system to deliver the OCT sample beam to the target at different transverse locations for the different A-scans, wherein the plurality of A-scans are arranged in one or more spiral patterns, and wherein the plurality of values of the reference path length are selected so that the plurality of A-scans span a depth range encompassing an expected variability of distance from the objective lens to a feature of the target; to process the plurality of A-scans to locate, relative to the objective lens, the corneal anterior surface, the lens capsule anterior surface, or the lens capsule posterior surface; and to control the cutting laser subsystem to generate the pulsed laser beam to be directed to the located corneal anterior surface, lens capsule anterior surface, or lens capsule posterior surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification