Optical surface identification for laser surgery
First Claim
1. A method of identifying optical surfaces in an eye for performing laser surgery on the eye, the eye including a cornea having anterior and posterior surfaces, a lens capsule having anterior and posterior surfaces, an iris, and a limbus, the method comprising:
- coupling the eye to a laser eye surgery system that includes an optical coherence tomography (OCT) imaging subsystem, the OCT imaging subsystem including a reference path length that is adjustable so that a distance from the laser eye surgery system to a detection window of the OCT imaging subsystem is adjustable, the OCT imaging subsystem employing a detection beam having a plurality of wavelengths such that the detection window spans a range of distances relative to the laser eye surgery system;
generating an OCT sample beam;
focusing the OCT sample beam at a plurality of different locations within the eye, the plurality of different locations include at least two different distances from the laser eye surgery system, the different distances defining a depth range encompassing an expected variability of distance from the laser eye surgery system to the corneal anterior surface, to the lens capsule anterior surface, or the lens capsule posterior surface; and
processing returning portions of the sample beam focused at the plurality of different locations to locate, relative to the laser eye surgery system, the corneal anterior surface, the lens capsule anterior surface, or the 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.
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Citations
36 Claims
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1. A method of identifying optical surfaces in an eye for performing laser surgery on the eye, the eye including a cornea having anterior and posterior surfaces, a lens capsule having anterior and posterior surfaces, an iris, and a limbus, the method comprising:
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coupling the eye to a laser eye surgery system that includes an optical coherence tomography (OCT) imaging subsystem, the OCT imaging subsystem including a reference path length that is adjustable so that a distance from the laser eye surgery system to a detection window of the OCT imaging subsystem is adjustable, the OCT imaging subsystem employing a detection beam having a plurality of wavelengths such that the detection window spans a range of distances relative to the laser eye surgery system; generating an OCT sample beam; focusing the OCT sample beam at a plurality of different locations within the eye, the plurality of different locations include at least two different distances from the laser eye surgery system, the different distances defining a depth range encompassing an expected variability of distance from the laser eye surgery system to the corneal anterior surface, to the lens capsule anterior surface, or the lens capsule posterior surface; and processing returning portions of the sample beam focused at the plurality of different locations to locate, relative to the laser eye surgery system, the corneal anterior surface, the lens capsule anterior surface, or the 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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18. A method for processing optical coherence tomography (OCT) data to generate a surface model of an optical surface of an eye, the eye including a cornea having anterior and posterior surfaces, a lens capsule having anterior and posterior surfaces, an iris, and a limbus, the method comprising:
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coupling the eye to a laser eye surgery system that includes optical coherence tomography (OCT) imaging subsystem, the OCT imaging subsystem including a reference path length that is adjustable so that a distance from the laser eye surgery system to a detection window of the OCT imaging subsystem is adjustable, the OCT imaging subsystem employing a detection beam having a plurality of wavelengths such that the detection window spans a range of distances relative to the laser eye surgery system; generating an OCT sample beam; processing returning portions of the sample beam to locate a point on the optical surface relative to the laser eye surgery system; focusing the OCT sample beam within the eye with the length of the reference path set to position the detection window based on the location of the point on the optical surface such that the detection window encompasses the optical surface for all expected variations in spatial disposition of the optical surface; processing returning portions of the sample beam so as to detect first locations on the optical surface within a first radial distance of the point on the optical surface; generating a first surface model of the optical surface based on the location of the point on the optical surface and the first locations on the optical surface; processing returning portions of the sample beam so as to detect second locations on the optical surface beyond the first radial distance and within a second radial distance from the point on the optical surface; and generating a second surface model of the optical surface based on the location of the point on the optical surface and the first and second locations on the optical surface. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method of identifying optical surfaces in an eye for performing laser surgery on the eye, the eye including a cornea having anterior and posterior surfaces, a lens capsule having anterior and posterior surfaces, an iris, a pupil, and a limbus, the method comprising:
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coupling the eye to a laser eye surgery system that includes an optical coherence tomography (OCT) imaging subsystem, the OCT imaging subsystem including a reference path length that is adjustable so that a distance from the laser eye surgery system to a detection window of the OCT imaging subsystem is adjustable, the OCT imaging subsystem employing a detection beam having a plurality of wavelengths such that the detection window spans a range of distances relative to the laser eye surgery system; using the OCT imaging subsystem to locate a centrally-located point on the lens capsule anterior surface; directing an OCT sample beam into the eye with the reference path length set to position the detection window to encompass the lens capsule anterior surface and the iris; processing returning portions of the sample beam to identify, relative to the laser eye surgery system, a plurality of edge points within the detection window, each edge point being disposed on an optical surface; generating a surface model of the lens capsule anterior surface based on the location of the centrally-located point on the lens capsule anterior surface and a subset of the edge points; selecting a subset of the edge points that are offset from the surface model of the lens capsule anterior surface; and generating a surface model of the iris based on the subset of the edge points that are offset from the surface model of the lens capsule anterior surface. - View Dependent Claims (30, 31, 32, 33)
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34. A method of generating a surface model of a posterior surface of a cornea of an eye, the cornea having an anterior surface, the method comprising:
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coupling the eye to a laser eye surgery system that includes an optical coherence tomography (OCT) imaging subsystem, the OCT imaging subsystem including a reference path length that is adjustable so that a distance from the laser eye surgery system to a detection window of the OCT imaging subsystem is adjustable, the OCT imaging subsystem employing a detection beam having a plurality of wavelengths such that the detection window spans a range of distances relative to the laser eye surgery system; directing an OCT sample beam into the eye with the reference path length set to position the detection window to encompass the cornea; generating a search volume defined by a first upper limit surface and a first lower limit surface, the first upper and lower limit surfaces being offset from a surface model of the cornea anterior surface; and processing returning portions of the OCT sample beam corresponding to the search volume to identify points located on the cornea posterior surface. - View Dependent Claims (35)
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36. A system for identifying optical surfaces in an eye for performing laser surgery on the eye, the eye including a cornea having anterior and posterior surfaces, a lens capsule having anterior and posterior surfaces, an iris, and a limbus, the system comprising:
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a laser eye surgery system; an OCT imaging subsystem, the OCT imaging subsystem including a reference path length that is adjustable so that a distance from the laser eye surgery system to a detection window of the OCT imaging subsystem is adjustable, the OCT imaging subsystem employing a detection beam having a plurality of wavelengths such that the detection window spans a range of distances relative to the laser eye surgery system; and a processor coupled to the laser eye surgery system and the OCT imaging subsystem, the processor configured to interact with the laser eye surgery system and the OCT imaging subsystem.
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Specification