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Optimization method for reducing astigmatism of progressive additional lens

A progressive multi-focus, optimization method technology, applied in the direction of installation, optics, instruments, etc., can solve the problems of not improving the effective viewing area, not being in a very ideal state of astigmatism distribution, and not having lens optimization, etc., to achieve effective and reliable The viewing area is enlarged, the optimization effect is uniform, and the effect of reducing astigmatism

Inactive Publication Date: 2013-01-23
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method only partially optimizes the lens, but does not fully optimize the entire lens, which cannot make the astigmatism distribution reach a very ideal state, and does not improve the effective viewing area, so there are still many defects

Method used

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  • Optimization method for reducing astigmatism of progressive additional lens
  • Optimization method for reducing astigmatism of progressive additional lens
  • Optimization method for reducing astigmatism of progressive additional lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this embodiment, the design requirement parameters of the lens to be processed are: the lens power of the far vision point is 0 diopter, the amount of light added between the distance vision and the near vision point is 1.8 diopters, and the lens channel length h=14 mm.

[0037] The lens parameters of the lens to be processed are: diameter 66mm, refractive index 1.523.

[0038] See attached figure 1 , It is a schematic diagram of the partition of a progressive multifocal lens. The lens surface is divided into the distance zone 1, the intermediate transition zone 2, the near vision zone 3 and the astigmatic zone 4.

[0039] See attached figure 2 , It is a flow chart of steps for optimizing the astigmatism of a progressive addition lens provided by this embodiment. The specific steps are:

[0040] 1. The initial lens shape and vector height distribution

[0041] In this embodiment, first, according to the method disclosed in US Patent 4861153, the initial vector height distribu...

Embodiment 2

[0066] The implementation steps are the same as the first embodiment, where θ is 3° and M is 35.

[0067] See attached Figure 8 , Which is an iso-power contour map of the progressive addition lens processed by the astigmatism optimization method provided in the second embodiment of the present invention. Compared image 3 with Figure 8 It can be seen that after adopting the technical solution provided by the second embodiment of the present invention, the iso-contour line with the optical power of 0 diopter becomes flatter, indicating that the clear range of the far vision area is significantly expanded, and the effective visual area of ​​the wearer is improved.

[0068] See attached Picture 9 , Which is the contour map of the astigmatism of the progressive addition lens processed by the astigmatism optimization method provided in the second embodiment of the present invention. Compared Figure 5 with Picture 9 It can be seen that after adopting the technical solution provided ...

Embodiment 3

[0070] The implementation steps are the same as in the first embodiment, where θ is 18° and M is 20.

[0071] See attached Picture 10 , Which is an iso-power contour line diagram of the progressive addition lens processed by the astigmatism optimization method provided in the third embodiment of the present invention. Compared image 3 with Picture 10 It can be seen that after adopting the technical solution provided by the third embodiment of the present invention, the iso-contour line with the optical power of 0 diopter becomes flatter, indicating that the clear range of the far vision area is significantly expanded, and the effective visual area of ​​the wearer is improved.

[0072] See attached Picture 11 , Which is the contour map of the astigmatism of the progressive addition lens processed by the astigmatism optimization method provided in the third embodiment of the present invention. Compared Figure 5 with Picture 11 It can be seen that after adopting the technical ...

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Abstract

The invention discloses a method for reducing the astigmatism of a progressive additional lens, and provides an overall astigmatism optimization method. The method comprises the following step of: adding initial rise distribution data to new rise distribution data of a freedom surface to obtain lens surface shape rise distribution data subjected to astigmatism optimization. After an initial progressive additional lens is optimized by the method provided by the invention, the maximum astigmatism of the lens is reduced by 14.3 percent. In the method, according to a curvature definition in differential geometry, each point is added with a corresponding freedom surface which is related to the minimum curvature and consists of micro cylindrical surfaces so as to reduce the astigmatism of each point, and the direction of each micro cylindrical surface is consistent with the minimum curvature direction of the point; therefore, by the method, the maximum astigmatism of the surface of the lenscan be effectively reduced, the distinct range of a vision far zone is enlarged, and the refraction capacity of a user in an effective vision zone is improved.

Description

Technical field [0001] The invention relates to a progressive addition lens, in particular to a processing method for reducing the astigmatism of the progressive addition lens. Background technique [0002] Progressive multifocal lenses can simultaneously meet the requirements for distance and near vision, and avoid defects such as breakage during the conversion between distance and near vision, such as bifocals. At present, progressive multifocal lenses are increasingly widely used. See attached figure 1 , Progressive multifocal lens surface is divided into far vision zone 1, intermediate transition zone 2, near vision zone 3, and astigmatism zone 4. [0003] Before the present invention was made, a US patent (US 4861153) disclosed a method for preparing ophthalmic lenses. This method often has large astigmatism in the peripheral astigmatism area, and excessive astigmatism on the lens will hinder the visual comfort of the lens wearer. If the initial design parameters are changed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/00G02B7/02G02B7/06
Inventor 秦琳玲钱霖余景池
Owner SUZHOU UNIV
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