Method and apparatus for calibrating and certifying accuracy of a wavefront sensing device
AssigneeBausch & Lomb Incorporated
InventorGriffith E. Altmann
Life of this patent
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Abstract
A calibration component for use in calibrating and certifying the accuracy of an ophthalmic wavefront sensor comprises a monolithic, plano-convex refractive optic having known amounts of one or more selected aberrations induced by the spherical, axisymmetric aspherical, or non-axisymmetric aspherical convex surface. An alignment tool is described, along with a procedure for calibrating an aberrometer.
Claims47
A calibration component for an aberrometer, comprising a monolithic, refractive optic having a convex anterior surface with a known amount of a desired aberration.
A model eye for use in calibrating an aberrometer for ophthalmic wavefront measurement, comprising a monolithic, refractive optic having a posterior surface and a convex anterior surface, said anterior surface having a known amount of an ocular aberration for a selected wavelength of light, and said posterior surface having a diffusely reflecting surface for said wavelength of light.
A method for calibrating an aberrometer for measuring ophthalmic wavefront aberrations, comprising the steps of:
- providing a model eye having a known wavefront aberration;
- positioning said model eye along an optical axis of an aberrometer to be calibrated at a location that simulates a wavefront measurement of a patient's eye;
- aligning said model eye;
- and
- obtaining a wavefront measurement of the model eye.
A method for making a focus calibration of an aberrometer used for measuring ophthalmic wavefront aberrations, comprising the steps of:
- providing a model eye having a known defocus error;
- positioning said model eye along an optical axis of an aberrometer to be calibrated at a location that simulates a wavefront measurement of a patient's eye;
- and
- obtaining a focus measurement of the aberrometer.
A method for making a defocus and astigmatism calibration of an aberrometer used for measuring ophthalmic wavefront aberrations, comprising the steps of:
- providing a model eye having a well characterized toroidal convex anterior surface;
- positioning said model eye along an optical axis of an aberrometer to be calibrated at a location that simulates a wavefront measurement of a patient's eye;
- and
- obtaining a defocus and astigmatism measurement of the model eye.
A method for making a higher-order aberration calibration of an aberrometer used for measuring ophthalmic wavefront aberrations, comprising the steps of:
- providing a model eye having a well characterized non-axisymmetric, convex anterior surface;
- positioning said model eye along an optical axis of an aberrometer to be calibrated at a location that simulates a wavefront measurement of a patient's eye;
- and
- obtaining a higher-order aberration measurement of the model eye.
Dependencies are inferred from the claim text.