Method for computing visual performance from objective ocular aberration measurements
First Claim
1. A method for computing the visual performance of a human or animal subject based on objective measurements of visual refraction including higher order aberrations, comprising the steps of:
- measuring wavefront aberrations of a subject ocular pupil;
computing a point-spread-function from the measured pupil aberration;
providing a test image; and
convolving the test image with the point-spread-function.
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Abstract
A method for computing the visual performance of a human or animal subject based on objective measurements of visual refraction, including higher order aberrations, includes measuring wavefront aberrations of a subject ocular pupil, computing a point-spread-function from the measured pupil aberration, providing a test image, and convolving the test image with the point-spread-function. A simulated image may be produced from the convolution result of the test image with the point-spread-function. One or more specific terms of the point-spread-function may be subtracted therefrom prior to the convolving step to simulate an effect of a correcting means, such as spectacles lenses, contact lenses, or laser surgery. A best correction for a given subject may be determined by adjusting the terms that are subtracted to optimize the resultant image.
97 Citations
21 Claims
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1. A method for computing the visual performance of a human or animal subject based on objective measurements of visual refraction including higher order aberrations, comprising the steps of:
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measuring wavefront aberrations of a subject ocular pupil;
computing a point-spread-function from the measured pupil aberration;
providing a test image; and
convolving the test image with the point-spread-function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for computing a point-spread-function of a human or animal ocular system from objective aberrometry measurements, comprising the steps of:
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measuring a pupil aberration function with an objective aberrometer;
aridcomputing the point-spread-function as a modulus squared of a Fourier transform of the measured pupil aberration function.
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10. A method for determining a visual acuity of an ocular optical system, comprising:
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measuring a pupil aberration function with an objective aberrometer;
computing a point-spread-function as a modulus squared of a Fourier transform of the measured pupil aberration function; and
analyzing a spatial extent of the point-spread-function.
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11. A method for determining Snellen acuity from evaluation of a double object when convolved with a point-spread-function, comprising the steps of:
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measuring a subject pupil aberration function with an objective aberrometer;
computing a point-spread-function from the modified pupil aberration function;
computing an Optical Transfer Function (OTF) from the computed point-spread-function;
providing an input image which consists of appropriate targets coded so that known image features can be correlated to a visual acuity number; and
convolving the input image with the point-spread-function by multiplying a Fourier transform of the input image by the OTF and then performing an inverse Fourier transform. - View Dependent Claims (12, 14, 16, 17, 18, 19, 20)
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13. A method for computing an image, comprising the steps of:
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measuring wavefront aberrations of a subject ocular pupil;
computing a point-spread-function from the measured pupil aberration;
providing a test image;
convolving the test image with the point-spread-function; and
producing a simulated image from a convolution result of convolving the test image with the point-spread-function, wherein at least one specific term of the point-spread-function is adjusted prior to the convolving step to simulate an effect of a correcting means.
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15. A method for computing an effect of corrective means on a subject'"'"'s visual acuity, comprising the steps of:
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measuring a subject pupil aberration function with an objective aberrometer;
adjusting terms in the measured subject pupil aberration function that correspond to specific corrective means, producing a modified pupil aberration function;
computing a point-spread-function from the modified pupil aberration function;
computing an optical transfer function (OTF) of the computed point-spread-function;
multiplying a Fourier transform of a test image by the OTF to produce a Fourier result; and
performing an inverse Fourier transform on the Fourier result.
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21. A method of determining a best correction for a given subject, comprising the steps of:
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measuring a subject pupil aberration function with an objective aberrometer;
subtracting terms from the pupil aberration function that correspond to specific corrective means, producing a modified pupil aberration function;
computing a point-spread-function from the modified pupil aberration function;
computing an optical transfer function (OTF) of the computed point-spread-function;
multiplying a Fourier transform of a test image by the OTF to produce a Fourier result;
performing an inverse Fourier transform on the Fourier result; and
adjusting the terms that are subtracted to optimize a resultant image.
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Specification