Customized design and efficient machining of astigmatism-minimized progressive addition lens
Astigmatism is inevitable and inherent to progressive addition lenses (PALs), which are typically distributed in the lateral areas on both sides of the progressive corridor. In this study, we took into account the spectacle frame for the customized freeform PAL design with the variational-difference numerical approach. The PAL surface with minimized astigmatism, approximately equal to 84% of the added power, was numerically resolved without expending the zone for clear vision. We validated our approach by experimentally demonstrating the procedure from tool path generation to surface power measurement, thus providing an efficient solution to the personalization of astigmatism-minimized PAL design and manufacture.
基金项目：This research was supported by the National Natural Science Foundation of China (No. 61775171), the Natural Science Foundation of Zhejiang Province (Nos. LY14F050009 and LY16H120007), the Science and Technology Program of Wenzhou (Nos. G20160033 and Y20160438), and the National Key Research and Development Program of China (No. 2016YFC0100200). The authors wish to thank Risheng Xia for supplying the frame data and thank Hongbin Liu and Jinming Li for their contributions to the diamond turning machine developed in lab.
Wei Huang：School of Optometry and Ophthalmology, Wenzhou Medical University, Wenzhou 325027, China
Haihua Feng：School of Optometry and Ophthalmology, Wenzhou Medical University, Wenzhou 325027, ChinaThe Eye Hospital of Wenzhou Medical University, Wenzhou 325027, China
Jiaojie Chen：School of Optometry and Ophthalmology, Wenzhou Medical University, Wenzhou 325027, ChinaThe Eye Hospital of Wenzhou Medical University, Wenzhou 325027, China
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