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Intraocular lens with large depth of focus based on the residual accommodation of the human eye

A technology of intraocular lens and accommodating power, applied in the field of vision correction, to achieve the effect of no biodegradation, large depth of focus performance, and reduction of eye aberration

Active Publication Date: 2016-05-18
TIANJIN SHI JI KANG TAI BIOMEDICAL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies of the existing intraocular lens, take into account the remaining accommodation power of the actual human eye, provide a large focal depth intraocular lens based on the remaining accommodation power of the human eye, improve the optical performance of the intraocular lens eye, and realize Correction of Presbyopia

Method used

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  • Intraocular lens with large depth of focus based on the residual accommodation of the human eye
  • Intraocular lens with large depth of focus based on the residual accommodation of the human eye
  • Intraocular lens with large depth of focus based on the residual accommodation of the human eye

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Embodiment 1

[0039] The front and back surfaces of the intraocular lens are set as even-order aspheric surfaces, the diopter is set to 22D, the selected material is PMMA, the refractive index is 1.494, and the Abbe number is 51.27. The surface shape of the aspheric intraocular lens can be described as:

[0040] z = cr 2 1 + 1 - ( 1 - k ) c 2 r 2 + a 1 r 4 + a 2 r 6 + a 3 r 8 + a 4 r 10 + a 5 r 12 + a 6 r 14 + a 7 r 16 .

[0041] Above a 1 ~a 7 The order is the even-order aspheric coefficients from the 4th order to the 16th order, c is the curvature at the apex of the aspheric surface (ie the reciprocal of the radius), r is the distance from any point on the aspheric surface to the optical axis, and k is the quadratic conic coefficient.

[0042] In Zemax optical design software, optimize the aspheric coefficient a 1 ~a 7 ,As shown in Table 1.

[004...

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Abstract

The invention relates to a large-focal-depth artificial lens based on a residual accommodation force of human eyes. According to the invention, the large-focal-depth artificial lens is made of a polymethyl methacrylate (PMMA) material and can be used for replacing a natural crystalline lens for human eyes with presbyopia., thereby realizing presbyopia correction. The front surface and the rear surface of the artificial lens are biconvex aspheric surfaces in a peripheral symmetric mode; and the diopter is 22D. Moreover, the artificial lens comprise an optical part and a loop connected with the optical part; the diameter of the optical part is 4.55mm; and the support loop plays a role in fixing the artificial lens. An object distance range from 0 to 4D is selected to optimize the surface parameter of the artificial lens and obtain the structure of the large-focal-depth artificial lens; and then the optical performance of the artificial lens eye is analyzed and the large-focal-depth performance of the artificial lens is verified.

Description

Technical field [0001] The invention belongs to the technical field of vision correction. Background technique [0002] When the normal human eye is in a natural state without adjustment, infinite objects are just imaged on the retina. When observing objects at close range, the eyes automatically generate adjustment signals, the ciliary muscles contract, and the radius of curvature of the lens surface decreases. However, as the age grows and the muscle adjustment ability declines, the adjustment ability of the lens gradually decreases, resulting in presbyopia, which can only clearly image a specific distance. [0003] The most traditional way to correct presbyopia is frame glasses. General frame glasses have a specific diopter, which can only see objects at a specific distance (usually the reading distance), and can't see clearly at other distances. At the same time, in the current treatment of senile cataract, intraocular lens replacement surgery has become a mature and reliabl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B3/02G02B1/04A61F2/16
CPCA61F2/1602G02B1/041G02B3/02
Inventor 刘永基王晓琳王肇圻
Owner TIANJIN SHI JI KANG TAI BIOMEDICAL ENG CO LTD
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