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High-order aberration compensation method for corneal refractive correction

A technology of high-order aberration and compensation method, which is applied in the field of high-order aberration compensation of corneal refractive correction, to achieve the effects of improving compensation accuracy, good visual quality and good compensation

Active Publication Date: 2019-03-19
杭州明视康眼科医院有限公司
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Problems solved by technology

[0010] In order to solve the problem of high-order aberration compensation in corneal refractive correction in the prior art and improve the visual quality after corneal refractive correction, the embodiment of the present invention proposes a high-order aberration compensation for corneal refractive correction method, to convert the qualitative and quantitative relations of coma, spherical aberration, and second-order astigmatism that affect vision and visual quality, improve compensation accuracy, and obtain better visual quality

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Embodiment

[0080] The embodiment of the present invention aims at compensating the high-order aberration in corneal refractive correction in the current technology, and proposes a high-order aberration compensation method based on ZZ Vector-Compensation FORMULA. High-order aberrations are often described by Zernike polynomials. The Zernike polynomial is a sequence function orthogonal to the unit circle, which can decompose the aberration into multiple order aberrations, so as to observe the magnitude of each order aberration. The Zernike polynomial consists of three parts: standardized coefficients, radius-dependent components (n), and azimuth-dependent components (m). In corneal refractive correction, the Zernike polynomial commonly used to calculate high-order aberrations is 6th-order 27 terms, and aberrations above the second order are high-order aberrations. figure 1 Shown is a 3D schematic of a Zernike polynomial of order 6 and 27 terms. Such as figure 1 As shown, in the Zernike ...

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Abstract

The invention provides a high-order aberration compensation method for corneal refractive correction. The compensation method is used for solving the problem that high-order aberration compensation methods in the prior art cannot meet requirements and comprises the steps that according to a wavefront fitting function of C7 and C8, the concave-sphere amount, astigmatism amount and the astigmatism angle after compensation of C7 and C8 are calculated; according to a wavefront fitting function of C12, the concave-sphere amount after compensation of C7, C8 and C12 is calculated; according to a wavefront fitting function of C11 and C13, the concave-sphere amount, astigmatism amount and the astigmatism angle after compensation of C7, C8, C11 and C12 are calculated. According to the method, a representation method of a Zernike polynomial and the low-order aberration diopter are converted, and the unit is unified; the comatic aberration, spherical aberration and second-order astigmatism are subjected to conversion of a qualitative and quantitative relationship, the high-order aberration for the corneal refractive correction of the human eyes is better compensated for, the compensation accuracy is improved, the better visual quality is obtained, and meanwhile the statistical difference is taken into account.

Description

technical field [0001] The invention belongs to the field of visual imaging and corneal correction, in particular to a high-order aberration compensation method for corneal refractive correction. Background technique [0002] Aberration refers to the inconsistency between the results obtained by non-paraxial ray tracing and the results obtained by paraxial ray tracing in the actual optical system, and the deviation from the ideal state of Gaussian optics (first-order approximation theory or paraxial ray). As a special imaging system, the eye usually uses aberration as an evaluation method of visual quality. The main component of human eye aberration is corneal aberration, and the front surface of cornea is the main source of corneal aberration. [0003] In the process of corneal refractive correction, since everyone’s corneal condition is different, each corneal refractive correction process adopts a personalized guidance method, which usually includes wavefront aberration ...

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Application Information

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IPC IPC(8): G02B27/00
CPCG02B27/0025
Inventor 郑历张君
Owner 杭州明视康眼科医院有限公司
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