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Proceedings Paper

Freeform surface of progressive addition lens represented by Zernike polynomials
Author(s): Yiyu Li; Risheng Xia; Jiaojie Chen; Haihua Feng; Yimin Yuan; Dexi Zhu; Chaohong Li
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Paper Abstract

We used the explicit expression of Zernike polynomials in Cartesian coordinates to fit and describe the freeform surface of progressive addition lens (PAL). The derivatives of Zernike polynomials can easily be calculated from the explicit expression and used to calculate the principal curvatures of freeform surface based on differential geometry. The surface spherical power and surface astigmatism of the freeform surface were successfully derived from the principal curvatures. By comparing with the traditional analytical method, Zernike polynomials with order of 20 is sufficient to represent the freeform surface with nanometer accuracy if dense sampling of the original surface is achieved. Therefore, the data files which contain the massive sampling points of the freeform surface for the generation of the trajectory of diamond tool tip required by diamond machine for PAL manufacture can be simplified by using a few Zernike coefficients.

Paper Details

Date Published: 28 October 2016
PDF: 7 pages
Proc. SPIE 9683, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 96830W (28 October 2016); doi: 10.1117/12.2245159
Show Author Affiliations
Yiyu Li, Wenzhou Medical Univ. (China)
Risheng Xia, Wenzhou Medical Univ. (China)
Jiaojie Chen, Wenzhou Medical Univ. (China)
Haihua Feng, Wenzhou Medical Univ. (China)
Yimin Yuan, Wenzhou Medical Univ. (China)
Dexi Zhu, Wenzhou Medical Univ. (China)
Chaohong Li, Wenzhou Medical Univ. (China)


Published in SPIE Proceedings Vol. 9683:
8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies
Wenhan Jiang; Li Yang; Oltmann Riemer; Shengyi Li; Yongjian Wan, Editor(s)

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