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
CN102419476BInactive Publication Date: 2013-01-23SUZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SUZHOU UNIV
Publication Date
2013-01-23
Estimated Expiration
Not applicable · inactive patent

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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.
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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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