Measuring refractive error of the human eye using optical coherence tomography
AssigneeAlcon Inc.
InventorsZsolt Bor, Alireza Malek Tabrizi
Life of this patent
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Abstract
Particular embodiments disclosed herein provide an apparatus for performing optometric measurements includes an optical coherence tomography (OCT) imaging system configured to output scanned parallel laser beams across a patient's eye. A line in the OCT image is identified, the line representing a retina of the patient's eye. A shape of the line is then used by the refractive error calculator to measure refractive error of the patient's eye. The height of the line due to curvature indicates degree of myopia or hyperopia. More complex curvature of the line corresponds to higher order aberrations. OCT images for a plurality of section planes may be used to calculate a wavefront elevation map.
Claims20
An apparatus for performing optometric measurements, comprising:
- an optical coherence tomography (OCT) imaging system configured to scan parallel beams across a patient's eye;
- and
- one or more processing devices;
- one or more memory devices coupled to the one or more processing devices, the one or more memory devices storing executable code that, when executed by the one or more processing devices, causes the one or more processing devices to:
- receive one or more OCT images of the patient's eye from the OCT imaging system;
- identify an apparent image of a retina of the patient's eye in the one or more OCT images;
- and
- calculate a refractive error of the patient's eye from a shape of the apparent image.
An apparatus for ocular imaging comprising:
- an optical coherence tomography (OCT) imaging system configured to scan parallel beams across the a patient's eye;
- one or more processing devices;
- one or more memory devices coupled to the one or more processing devices, the one or more memory devices storing executable code that, when executed by the one or more processing devices, causes the one or more processing devices to:
- receive a plurality of OCT images of the patient's eye from the OCT imaging system, each OCT image of the plurality of OCT images corresponding to one of a plurality of section planes of the patient's eye such that each pixel in each OCT image of the plurality of OCT images represents an X, Y, and Z coordinate within the patient's eye;
- identify pixels in the plurality of OCT images representing a retina of the patient's eye to obtain a surface corresponding to a wavefront elevation map of the patient's eye.
A method for performing optometric measurements comprising:
- scanning, by an optical coherence tomography (OCT) imaging system, parallel beams across a patient's eye to obtain a plurality of OCT images for a plurality of section planes of the patient's eye;
- identifying pixels representing a retina of the patient's eye in the plurality of OCT images to obtain a wavefront elevation map;
- and
- calculating a refractive error of the patient's eye using the wavefront elevation map.
Dependencies are inferred from the claim text.