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Proceedings Paper

Progressive addition lens design by optimizing NURBS surface
Author(s): Yen-Liang Liu; Wei-Yao Hsu; Yuan-Chieh Cheng; Guo-Dung Su
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Paper Abstract

Progressive addition lenses (PAL) are used to compensate presbyopia, which is induced by losing accommodation of elder eyes. These eyes need different optical power provided by eye glasses while watching objects at different distance. A smaller optical power is required in further distance and a larger one in nearer zone. A progressive addition lens can provides different power requirements in one piece of lens. This paper introduces a whole process of PAL production, from design, fabrication, to measurement. The PAL is designed by optimizing NURBS surface. Parameters of merit function are adjusted to design lenses with different specifications. The simulation results confirm that the power distributes as expected and cylinders are controlled under an acceptable level. Besides, sample lenses have been fabricated and measured. We apply precise-machining to produce the molds for plastic injection. Then, the samples are produced by injecting polycorbonate to the molds. Finally, Ultra Accuracy 3D Profilemeter is used to measure the sample PALs. Practical examinations shows that our designs are achievable and feasible in practice use.

Paper Details

Date Published: 23 September 2011
PDF: 9 pages
Proc. SPIE 8128, Current Developments in Lens Design and Optical Engineering XII; and Advances in Thin Film Coatings VII, 81280H (23 September 2011); doi: 10.1117/12.892979
Show Author Affiliations
Yen-Liang Liu, National Taiwan Univ. (Taiwan)
Wei-Yao Hsu, National Taiwan Univ. (Taiwan)
Yuan-Chieh Cheng, National Applied Research Labs. (Taiwan)
Guo-Dung Su, National Taiwan Univ. (Taiwan)

Published in SPIE Proceedings Vol. 8128:
Current Developments in Lens Design and Optical Engineering XII; and Advances in Thin Film Coatings VII
R. Barry Johnson; Virendra N. Mahajan; Simon Thibault, Editor(s)

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