Optimizing design of progressive addition lenses

Linling Qin; Chunmei Zeng; Lin Qian; Jingchi Yu

doi:10.1117/12.974297

15 October 2012 Optimizing design of progressive addition lenses

Linling Qin, Chunmei Zeng, Lin Qian, Jingchi Yu

Proceedings Volume 8420, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical System Technologies for Manufacturing and Testing; 84201G (2012) https://doi.org/10.1117/12.974297
Event: 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2012), 2012, Xiamen, China

Abstract

Progressive addition lenses are a kind of ophthalmic lenses with freeform surface. The surface curvature of the progressive addition lenses varies gradually from a minimum value in the upper, far-view zone, to a maximum value in the lower, near-view zone. The increasing mean power from far-view zone to near-view zone is called addition mean power. The far-view zone, near-view zone and the intermediate zone are called effective usable area of the lens. In this paper, the design principles of progressive addition lenses are discussed. Several kinds of design methods are illustrated, and their advantages and disadvantages are also represented. A global optimizing method using curvature compensation is proposed which can reduce the undesirable astigmatism in some regions of the progressive addition lens surface while retaining desirable optical features of the progressive lenses. The total optimizing design thought is to reduce astigmatism of each point by reducing the curvature difference using curvature compensation. The value of the surface vector height of the optimized PAL is calculated by adding the value of the surface vector height of the initially designed PAL and the value of the surface vector height of a new freeform. The contours of the power and astigmatism of the initially designed PAL and optimized PAL from the example are given. It is shown that the largest astigmatism is reduced after optimization and the effective usable area in the far-view zone is expanded obviously.

Citation Download Citation

Linling Qin, Chunmei Zeng, Lin Qian, and Jingchi Yu "Optimizing design of progressive addition lenses", Proc. SPIE 8420, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical System Technologies for Manufacturing and Testing, 84201G (15 October 2012); https://doi.org/10.1117/12.974297

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KEYWORDS

Monochromatic aberrations

Lenses

Lens design

Composites

Eye

Optics manufacturing

Partial differential equations

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