Performance Evaluation Method of Progressive Multifocal Freeform Surface Lens

A progressive multifocal and evaluation method technology, applied in the field of optical performance, can solve problems such as increasing the defective rate of progressive multifocal lenses, and achieve the effect of shortening the design cycle, reducing the processing reject rate, and being highly implementable.

Inactive Publication Date: 2019-06-28
UNIV OF SHANGHAI FOR SCI & TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] Although there are many evaluation methods for progressive focus eyes at home and abroad, and some of them have been widely used in daily life, all of the existing methods have certain defects, and these evaluation methods do not affect the design of lenses in the design stage. Errors are analyzed, but after the lens surface design is completed, it is directly processed on the corresponding free-form surface processing machine tool, which greatly increases the defective rate of progressive multi-focal lenses

Method used

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  • Performance Evaluation Method of Progressive Multifocal Freeform Surface Lens
  • Performance Evaluation Method of Progressive Multifocal Freeform Surface Lens
  • Performance Evaluation Method of Progressive Multifocal Freeform Surface Lens

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Embodiment Construction

[0027] Such as figure 1 Shown is a schematic diagram of the performance evaluation of progressive multifocal free-form surface lenses. Place the lens 3 directly in front of the human eye 1, the horizontal line passing the eyeball center of the human eye 1 is the optical axis 6, the intersection of the optical axis 6 and the front surface of the lens 3 is the front surface vertex 5, and the front surface vertex 5 of the lens 3 is away from the human The length of the eyeball center is 27mm. According to the facial features of the wearer, the lens 3 is inclined at a certain angle 7 along the vertical line of the optical axis 6, and the range is 10-12°. This is used to simulate different wearing states, that is, the face shape.

[0028] Such as figure 2 The grid division standard diagram is shown. The diameter 8 of the lens 3 is R, which is divided according to the radius r of the pupil of the eye of different wearers. The grid 9 is square and the side length of the grid is r. The...

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Abstract

The invention relates to a progressive addition freeform-surface lenses performance evaluation method. The method is a method for evaluating focal power, astigmatism and axial distribution of lenses when a person wears progressive addition freeform-surface lenses in the multiple optical axes state from the perspective of multiple optical axes in the design stage. According to the invention, the influence of optical axis change on focal power, astigmatism and axial distribution of lenses when a person wears progressive addition freeform-surface lenses to see faraway and near places and perimeter zone in the multiple optical axes state is provided, and conformity and weighting factor of different areas of the lenses also can be provided. After normalization processing, weight factor thresholds of focal power of lenses' lattice points, astigmatism and axial distribution of the progressive addition freeform-surface lenses in the multiple optical axes state are calculated for evaluation. According to the weight factor thresholds, the difference between the progressive addition freeform-surface designed in the multiple optical axes state and a prescription is obtained, and errors of parameters in the design process are understood. By the evaluation method, design period can be shortened, rejection rate of processing can be reduced, and product qualification ratio can be raised.

Description

Technical field [0001] The invention relates to an optical performance, in particular to a performance evaluation method of a progressive multi-focus free-form surface lens. Background technique [0002] Progressive multifocal lenses are free-form surface lenses designed on the basis of double-lens, tri-lens and multifocal glasses, which overcome the shortcomings of image jump caused by sudden changes in power and boundary marks on the surface of the lens. It is a lens whose power gradually increases from top to bottom. With the observation range of the human eye from far to near, the optical power of this lens gradually increases, and only one lens can correct vision in all fields of view. [0003] For the performance evaluation of the progressive addition lens, the optical power and astigmatism distribution diagrams are mainly used, which are mainly used to represent and evaluate the two-dimensional or three-dimensional graphics of the optical performance of the progressive addi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02C7/06G02C7/02
CPCG02C7/028G02C7/061
Inventor 项华中武杰郑刚王成付东翔张通庄松林陈家璧
Owner UNIV OF SHANGHAI FOR SCI & TECH
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