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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 that the distribution of astigmatism cannot be very ideal, there is no lens optimization, and the effective viewing area is not improved well, so as to achieve effective and reliable The viewing area is enlarged, the astigmatism is reduced, and the optimization effect is uniform.

Inactive Publication Date: 2012-04-18
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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
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Effect test

Embodiment 1

[0037] In this embodiment, the design requirements parameters of the lens to be processed are: the power of the far point lens is 0 diopter, the amount of light added between the far point and the near point is 1.8 diopter, and the lens channel length h=14 mm.

[0038] The lens parameters of the lens to be processed are: diameter 66mm, refractive index 1.523.

[0039] See attached figure 1 , which is a schematic diagram of the partitions of the progressive multifocal lens. The surface of the lens is divided into a distance vision zone 1, an intermediate transition zone 2, a near vision zone 3 and an astigmatism zone 4.

[0040] See attached figure 2 , which is a flow chart of steps for optimizing the astigmatism of the progressive multifocal lens provided in this embodiment, and the specific steps are:

[0041] 1. Sag height distribution of initial lens surface shape

[0042] In this embodiment, the initial sagittal height distribution data z of the progressive multifocal ...

Embodiment 2

[0067] The implementation steps are as in Example 1, wherein θ is 3°, and M is 35.

[0068] See attached Figure 8 , which is the contour line diagram of the equal power of the progressive multifocal lens processed by the astigmatism optimization method provided in Embodiment 2 of the present invention. Compared image 3 with Figure 8 It can be seen that after adopting the technical solution provided by Embodiment 2 of the present invention, the isocontour line with a focal power of 0 diopter becomes flatter, indicating that the clear range of the far vision zone is obviously expanded, and the wearer's effective viewing zone is improved.

[0069] See attached Figure 9 , which is the contour line map of the astigmatism of the progressive multifocal lens processed by the astigmatism optimization method provided in Embodiment 2 of the present invention. Compared Figure 5 with Figure 9 It can be seen that after adopting the technical solution provided by Embodiment 2, th...

Embodiment 3

[0071] The implementation steps are as in Example 1, wherein θ is 18°, and M is 20.

[0072] See attached Figure 10 , which is the contour map of the equal power of the progressive multifocal lens processed by the astigmatism optimization method provided in Embodiment 3 of the present invention. Compared image 3 with Figure 10 It can be seen that after adopting the technical solution provided by Embodiment 3 of the present invention, the isocontour line with a focal power of 0 diopter becomes flatter, indicating that the clear range of the far vision zone is significantly expanded, and the wearer's effective viewing zone is improved.

[0073] See attached Figure 11 , which is the contour line map of the astigmatism of the progressive multifocal lens processed by the astigmatism optimization method provided in the third embodiment of the present invention. Compared Figure 5 with Figure 11 It can be seen that after adopting the technical solution provided by Embodime...

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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 multifocal lens, in particular to a processing method for reducing the astigmatism of the progressive multifocal lens. Background technique [0002] Progressive multifocal lenses can meet the needs of distance vision and near vision at the same time, and avoid the defects of bifocal lenses such as breakage when switching between distance vision and near vision. At present, progressive multifocal lenses are widely used. See attached figure 1 , The surface of the progressive multifocal lens is divided into a distance zone 1, an intermediate transition zone 2, a near zone 3, and an astigmatism zone 4. [0003] Before the present invention was made, US Patent (US 4861153) disclosed a preparation method of ophthalmic lenses. This method often has a 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 param...

Claims

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Application Information

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