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Progressive addition lens with large visual areas and low astigmatism

A progressive multi-focal lens technology, applied in the field of progressive multi-focal lenses, can solve the problem of not improving the effective viewing area, etc., and achieve the effect of increasing the effective viewing area, keeping the optical parameters unchanged, and uniform optimization effect

Active Publication Date: 2012-05-02
SUZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, in the prior art, the distribution of astigmatism cannot be achieved in a very ideal state, and the effective viewing area has not been improved well, so there are still many defects

Method used

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  • Progressive addition lens with large visual areas and low astigmatism
  • Progressive addition lens with large visual areas and low astigmatism
  • Progressive addition lens with large visual areas and low astigmatism

Examples

Experimental program
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Embodiment 1

[0028] In this embodiment, the design requirements parameters of the lens to be processed are: the power of the far point lens is 2 diopters, the amount of light added between the far point and the near point is 1.8 diopters, and the lens channel length h=14 mm.

[0029] The lens parameters of the lens to be processed are: diameter 66mm, refractive index 1.523.

[0030] 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.

[0031] A specific step for optimizing the astigmatism of the progressive multifocal lens provided by this embodiment is:

[0032] 1. Sag height distribution of initial lens surface shape

[0033] In this embodiment, the initial sagittal height distribution data z of the progressive multifocal lens surface shape before optimization is obtained according to ...

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Abstract

The invention discloses a progressive addition lens with large visual areas and low astigmatism. The lens is characterized in that micro free-form surface layers are arranged in two astigmatic areas on the surface of the lens and are formed by numerous small cylindrical surfaces with different curvatures; and the direction of each small cylindrical surface is identical with the direction of the minimum curvature of the point. The progressive addition lens has the following advantages: the maximum astigmatism of the progressive addition lens is reduced by 14.3% compared with that of the initial progressive addition lens; and the maximum astigmatism of the lens surface can be effectively reduced, the definition range of the distant visual area can be expanded and the refractive power of theeffective visual areas of a wearer can be improved.

Description

technical field [0001] The invention relates to a progressive multifocal lens, in particular to a progressive multifocal lens with a large viewing area and small astigmatism. Background technique [0002] Progressive multifocal lenses are also known as progressive lenses, as the name implies, there are multiple focal points on one lens. In 1907, Owen Aves first proposed the idea of ​​progressive multifocal lenses, marking the birth of a new concept of vision correction. The design of this particular lens was inspired by the shape of an elephant's trunk. People make the curvature of the front surface of the lens increase continuously from top to bottom, so that the refractive power can be changed accordingly, that is, the refractive power increases gradually and continuously from the far zone on the upper part of the lens until it reaches the required near zone in the near zone on the bottom of the lens. Use diopters. [0003] With the development of computers, advanced de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02C7/02G02C7/06G02B27/00
Inventor 秦琳玲钱霖余景池
Owner SUZHOU UNIV
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