Method for computing visual performance from objective ocular aberration measurements

A method for determining a visual acuity of an ocular optical system, comprising:

• 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.

A method for determining Snellen acuity from evaluation of a double object when convolved with a point-spread-function, comprising the steps of:

• 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.

A method for computing an image, 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;
• 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.

A method for computing an effect of corrective means on a subject's visual acuity, comprising the steps of:

• 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.

A method of determining a best correction for a given subject, comprising the steps of:

• 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.