5 August 2015 A design of PAL with astigmatism
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Abstract
Progressive addition lens (PAL) is designed for those who suffer from myopia and presbyopia to have a clear vision from a far distance to a nearby distance. Additionally there are many people that also suffer from astigmatism and need to be corrected. The cylinder power can’t be simply added to the diopter of the PAL directly, because the diopter of the PAL needs to be changed smoothly. A methods has been proposed in this article to solve the problem, the freeform surface height of a PAL without astigmatism and the cylindrical lens surface height for the correction of astigmatism are calculated separately. The both two surface heights were added together, then the final surface is produced and shown with the both properties of PALs and cylindrical lenses used to correct the astigmatism.
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Yefei Wei, Yefei Wei, Huazhong Xiang, Huazhong Xiang, Tianfeng Zhu, Tianfeng Zhu, Jiabi Chen, Jiabi Chen, } "A design of PAL with astigmatism", Proc. SPIE 9618, 2015 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 961819 (5 August 2015); doi: 10.1117/12.2196275; https://doi.org/10.1117/12.2196275
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