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High-efficiency manufacturing method for intraocular lens with correction of high-order wavefront aberration

A technology of intraocular lens and wavefront aberration, applied in intraocular lens, eye implant, etc., can solve the problem that intraocular lens is not suitable for mass production

Inactive Publication Date: 2012-06-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the wavefront aberration of each person is different, therefore, this intraocular lens is not suitable for mass production with the help of micro-injection molding technology

Method used

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  • High-efficiency manufacturing method for intraocular lens with correction of high-order wavefront aberration
  • High-efficiency manufacturing method for intraocular lens with correction of high-order wavefront aberration
  • High-efficiency manufacturing method for intraocular lens with correction of high-order wavefront aberration

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Embodiment

[0040] Example: For a common diameter of 6mm, the curvature is 0.141mm -1 The spherical base intraocular lens is processed for wavefront aberration correction. The specific correction amount required is measured by the Hartmann-Shack aberrometer developed by the Institute of Optoelectronic Technology, Chinese Academy of Sciences. The corresponding Zernike polynomial coefficients are the first 35 items. After micro-injection molding processing, the artificial lens substrate with the surface of Ra=18nm and Rt=99nm is obtained, and the material is medical PMMA material (polymethyl methacrylate). The substrate is fixed on the rotating spindle through a design fixture, and a diamond tool with a radius of 0.2mm is used for cutting. The processing program is designed according to the tool compensation method. The specific processing parameters are the spindle speed 72rpm, and the rough machining x-direction feed is 3.0mm. / min, the cutting depth is 2um each time, the cutting process ...

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Abstract

The invention belongs to the technical field of ultraprecise machining of optical devices and relates to a high-efficiency manufacturing method of an intraocular lens with correction of high-order wavefront aberration. The high-efficiency manufacturing method comprises the following steps of: (1) adopting an ultraprecise turning or grinding technology to machine an aspherical substrate mold of the intraocular lens; (2) adopting a micro-injection forming and machining method and utilizing the mold to machine a substrate of the aspherical intraocular lens in batch; (3) manufacturing a fixed clamp adaptive to the substrate of the intraocular lens; (4) adopting a wavescan to carry out wavefront aberration measurement on a specific patient, and obtaining a Zernike polynomial description of the wavefront aberration of the patient; (5) designing an ultraprecise machining path for correcting a curved-surface part based on the Zernike polynomial description of the wavefront aberration of the patient; and (6) fixing the substrate of the intraocular lens on an ultraprecise lathe by the clamp, adopting a slow-knife or quick-knife servo drive to realize ultraprecise lathe machining for correcting the curved-surface part, and finally obtaining the intraocular lens with the wavefront aberration adaptive to a patient. The high-efficiency manufacturing method has the advantages of low cost and high machining efficiency.

Description

technical field [0001] The invention belongs to the technical field of ultra-precision processing of optical devices, and in particular relates to an ultra-precision processing method of an implanted artificial lens. Background technique [0002] The lens in a normal eye is transparent, and external light passes through the lens and converges on the retina to form an image. However, the light transmittance and light absorption of the lens of cataract patients are greatly reduced, causing the lens to become cloudy or even completely opaque. Improving visual quality and improving visual function after cataract surgery is one of the focuses of current ophthalmic medical research. Currently the most effective way to treat cataracts is intraocular lens implantation. [0003] Intraocular lens is a kind of intraocular artificial device, which is used for lens replacement after cataract surgery. It is generally mass-produced by micro-injection molding technology. Due to the limita...

Claims

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Application Information

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IPC IPC(8): A61F2/16
Inventor 张效栋房丰洲
Owner TIANJIN UNIV
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