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Proceedings Paper

Optimizing design of progressive addition lenses
Author(s): Linling Qin; Chunmei Zeng; Lin Qian; Jingchi Yu
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Paper 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.

Paper Details

Date Published: 15 October 2012
PDF: 5 pages
Proc. SPIE 8420, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical System Technologies for Manufacturing and Testing, 84201G (15 October 2012); doi: 10.1117/12.974297
Show Author Affiliations
Linling Qin, Soochow Univ. (China)
Chunmei Zeng, Soochow Univ. (China)
Lin Qian, Soochow Univ. (China)
Jingchi Yu, Soochow Univ. (China)


Published in SPIE Proceedings Vol. 8420:
6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical System Technologies for Manufacturing and Testing
Xiangdi Lin; Yoshiharu Namba; Tingwen Xing, Editor(s)

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