Zone extension systems and methods
AssigneeAMO Development, LLC
InventorGuang-ming Dai
Life of this patent
Estimating the term…
Abstract
Wavefront measurements of eyes are often taken when the pupil is in a first configuration in an evaluation context. The results can be represented by a set of basis function coefficients. Prescriptive treatments are often applied in a treatment context, which is different from the evaluation context. Hence, the patient pupil can be in a different, second configuration, during treatment. Systems and methods are provided for determining a transformed set of basis function coefficients, based on a difference between the first and second configurations, which can be used to establish the vision treatment.
Claims20
A method of calculating effective powers of an optical system, through the use of a computer processor, the method comprising:
- calculating a first effective power using a first Zernike expansion coefficient for the optical system, the first Zernike expansion coefficient associated with a first aperture dimension;
- and
- calculating a second effective power using a second Zernike expansion coefficient for the optical system, the second Zernike expansion coefficient associated with a second aperture dimension, the second aperture dimension greater than the first aperture dimension, the second Zernike expansion coefficient scaled relative to the first Zernike expansion coefficient using a scaling factor comprising a ratio of the second aperture dimension to the first aperture dimension raised to a power of a factor comprising a radial degree of the coefficient.
A system for calculating effective power for an optical system, the system comprising a data processing module comprising a processor and a tangible non-transitory computer readable medium, the computer readable medium programmed with a computer application that, when executed by the processor, causes the processor to:
- receive a first Zernike expansion coefficient for the optical system, the first Zernike expansion coefficient associated with a first aperture dimension, and
- calculate a second effective power using a second Zernike expansion coefficient for the optical system, the second Zernike expansion coefficient associated with a second aperture dimension,
- wherein the second aperture dimension is greater than the first aperture dimension, and the second Zernike expansion coefficient is scaled relative to the first Zernike expansion coefficient using a scaling factor comprising a ratio of the second aperture dimension to the first aperture dimension raised to a power of a factor comprising a radial degree of the coefficient.
A computer program product for calculating effective powers of an optical system, the computer program product comprising:
- code for calculating a first effective power using a first Zernike expansion coefficient for the optical system, the first Zernike expansion coefficient associated with a first aperture dimension;
- and
- code for calculating a second effective power using a second Zernike expansion coefficient for the optical system, the second Zernike expansion coefficient associated with a second aperture dimension, the second aperture dimension greater than the first aperture dimension, the second Zernike expansion coefficient scaled relative to the first Zernike expansion coefficient using a scaling factor comprising a ratio of the second aperture dimension to the first aperture dimension raised to a power of a factor comprising a radial degree of the coefficient;
- and
- a computer-readable medium for storing the codes.
Dependencies are inferred from the claim text.