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Astigmatism optimizing method of progressive multifocal lens for eyes

A progressive multi-focal, ophthalmic lens technology, applied in glasses/goggles, optics, instruments, etc., can solve problems such as deterioration of regional optical properties, hindering the visual comfort of lens wearers, etc., and achieve the effect of reducing astigmatism

Inactive Publication Date: 2012-09-26
SUZHOU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method tends to have large astigmatism in the peripheral astigmatism zone, and excessive astigmatism on the lens can hinder the visual comfort of the lens wearer
If the initial design parameters are changed, the optical properties of the areas on the lens that already meet the requirements will be deteriorated

Method used

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  • Astigmatism optimizing method of progressive multifocal lens for eyes
  • Astigmatism optimizing method of progressive multifocal lens for eyes
  • Astigmatism optimizing method of progressive multifocal lens for eyes

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Embodiment

[0033] In this embodiment, the design requirements parameters of the lens to be processed are: the diopter of the lens at the far point of vision is 0 degrees, the amount of light added between the far point of vision and the near point of vision is 3 diopters, and the lens channel length h=17 mm.

[0034] The lens parameters of the lens to be processed are: diameter 72mm, refractive index 1.523.

[0035] See attached figure 1 , which is a schematic diagram of the partitions of progressive multifocal ophthalmic lenses.

[0036] See attached figure 2 , which is a flow chart of steps for optimizing the astigmatism of the progressive multifocal ophthalmic lens provided in this embodiment, and the specific steps are:

[0037] 1. Sag height distribution of initial lens surface shape

[0038] In this embodiment, the initial sagittal height distribution data z of the multifocal ophthalmic lens surface shape before optimization is obtained according to the method disclosed in US P...

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Abstract

The invention relates to an astigmatism optimizing method of a progressive multifocal lens for eyes. In the astigmatism optimizing method, 80 percent of area of a profile of the progressive multifocal lens or a part of the area is selected as an astigmatism optimizing area on the basis of the initial rise distributed data of the obtained profile of the progressive multifocal lens for eyes according to the prior art, wherein the astigmatism value of the 80 percent of area is larger than a light increasing amount. The astigmatism optimizing method of the progressive multifocal lens for eyes comprises the following steps of: subtracting spherical rise distribution taking the average value of the focal power of the area as the focal power from the initial rise data distribution of the area toobtain the data distribution of the rise difference of two cambers; smoothing the data distribution of the rise difference of the two cambers by adopting an average curvature flow; and pulsing an obtained result and the spherical rise distribution to obtain the rise distribution data of the profile of the lens subjected to astigmatism optimization. The invention can effectively reduce the maximumastigmatism of the surface of the progressive multifocal lens for eyes through optimizing step processing; in addition, the refraction capacity of an effective visual area is basically unchanged.

Description

technical field [0001] The invention relates to an ophthalmic lens technology, in particular to a processing method for reducing the astigmatism of a progressive multifocal ophthalmic lens. Background technique [0002] Progressive multifocal ophthalmic lenses can meet the needs of distance vision and near vision at the same time, and avoid the defects of bifocal lenses such as visual breakage when switching between distance vision and near vision. Therefore, the application of progressive multifocal ophthalmic lenses is becoming more and more extensive. See attached figure 1 , The surface of the progressive multifocal ophthalmic lens is divided into a distance zone 1, an intermediate transition zone 2, a near zone 3 and an astigmatism zone 4. Far vision zone: the wide area located in the upper half of the progressive multifocal ophthalmic lens, which corrects the distance vision ability when the human eye is in a relaxed state of vision, providing a clear and wide field of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02C7/02G02B27/00
Inventor 吴泉英唐运海吴峰钱霖余景池朱锡芳
Owner SUZHOU UNIV OF SCI & TECH
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