After-cornea refractive surgery artificial lens design

A technique of intraocular lens and refractive surgery, applied in the field of vision correction and cataract treatment, can solve the problems of inaccurate degree, refractive abnormality, uncorrectable astigmatism, etc., and achieve the effect of correcting defocus and astigmatism

Inactive Publication Date: 2010-01-06
NANKAI UNIV
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AI Technical Summary

Problems solved by technology

[0010] Although there are many methods, it is found in clinical practice that the calculated degrees are not accurate (the error can reach 5D), resulting in different degrees of refractive error after cataract surgery
Also, current methods cannot correct for astigmatism

Method used

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  • After-cornea refractive surgery artificial lens design
  • After-cornea refractive surgery artificial lens design

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Embodiment Construction

[0024] specific implementation

[0025] Such as figure 1 As shown, the corneal topograph Orbscan II [1] was used to measure the curvature of the front and rear surfaces of the cornea and the height relative to the reference sphere. The height difference of the corneal surface along the sagittal direction is converted into the height difference along the optical axis direction, and the aspheric surface of the cornea is fitted by a high-order aspheric function [2].

[0026] BMF-200A Ultrasonic Thickness Gauge [3] is used to measure the axial spacing of the various components of the eye axis, including corneal thickness, anterior chamber depth, lens thickness and vitreous thickness [4].

[0027] The Wavescan II wavefront aberration instrument[5] is used to measure the wavefront aberration of the human eye[6], and the aberration data of the individual human eye is added to the optimization function of the optical design software Zemax to define the actual aberration of the human ...

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Abstract

The invention belongs to the technical field of vision correction and cataract vision therapy. A before-refractive surgery individualized eye model is built by using ZEMAX optical design software according to a corneal topography, an axial distance between components in an eye and a wavefront aberration which are obtained before the cornea refractive surgery; an after-refractive surgery individualized eye model is built by combining an wavefront aberration actually measured after the cornea refractive surgery; and, finally, a bispherical artificial lens for correcting defocusing and a spherical column-shaped artificial lens for correcting a defocusing and astigmation are designed by using the model.

Description

technical field [0001] The invention belongs to the technical fields of vision correction and cataract treatment. Background technique [0002] Since the 1980s, corneal refractive surgery has been gradually accepted and carried out worldwide. As people grow older, cataracts have occurred in many people after the first generation of corneal refractive surgery (referred to as postoperative). At present, the methods used clinically to measure the power of the intraocular lens (Intraocular Lens, IOL) mainly include: [0003] (1) The clinical history method proposed by Holladay J T, that is, the postoperative corneal diopter is equal to the corneal diopter before corneal refractive surgery (referred to as preoperative) minus the surgically changed diopter, and then the IOL power is calculated using the classic formula. [0004] (2) IOL adjustment method, including Feiz-Mannis adjustment method and Masket adjustment method, the former uses the preoperative corneal diopter to cal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/16A61F9/00
Inventor 王肇圻饶丰
Owner NANKAI UNIV
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