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6 October 2010 A kind of optimizing design method of progressive addition lenses
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Proceedings Volume 7655, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies; 76551T (2010) https://doi.org/10.1117/12.864316
Event: 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2010, Dalian, 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, distance-viewing area, to a maximum value in the lower, near-viewing area. A kind of optimizing design method of progressive addition lenses is proposed to improve the optical quality by modifying the vector heights of the surface of designed progressive addition lenses initially. The relationship among mean power, cylinder power and the vector heights of the surface is deduced, and the optimizing factor is also gained. The vector heights of the surface of designed progressive addition lenses initially are used to calculate the plots of mean power and cylinder power based on the principle of differential geometry. The mean power plot is changed by adjusting the optimizing factor. Otherwise, the novel plot of the mean power can also be derived by shifting the mean power of one selected region to another and then by interpolating and smoothing. A partial differential equation of the elliptic type is founded based on the changed mean power. The solution of the equation is achieved by iterative method. The optimized vector heights of the surface are solved out. Compared with the original lens, the region in which the astigmatism near the nasal side on distance-vision portion is less than 0.5 D has become broader, and the clear regions on distance-vision and near-vision portion are wider.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yunhai Tang, Lin Qian, Quanying Wu, Jingchi Yu, Hao Chen, and Yuanyuan Wang "A kind of optimizing design method of progressive addition lenses", Proc. SPIE 7655, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 76551T (6 October 2010); https://doi.org/10.1117/12.864316
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