Progressive addition freeform-surface lenses performance evaluation method

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 method for evaluating the performance of a progressive multi-focus free-form surface lens. Background technique [0002] Progressive multifocal lens is a free-form surface lens designed on the basis of bifocals, trifocals and multifocal glasses, which overcomes the shortcomings of image jump caused by sudden changes in focal power and boundary marks on the surface of the lens. It is a lens whose optical power increases gradually from top to bottom. As the human eye observes from far to near, the focal power of this lens increases gradually, and only one lens can correct the vision of all fields of view. [0003] For the performance evaluation of progressive multifocal lenses, optical power and astigmatism distribution diagrams are mainly used in optics, which are mainly two-dimensional or three-dimensional graphics used to express and evaluate the optical performance of progressive mu...

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

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