[9] H Z XIANG, J D GAO, N N LI. Comparison of different astigmatic optical lenses by direct measurement of surface shape. Optical Engineering, 59, 024113(2020).
[12] WINTHROP J T, CPATION A O. Progressive addition spectacle lens: US, 4861153[P]. 19890819.
[13] STEELE T, MCLOUGHLIN H, PAYNE D. Progressive addition power lens: US, 6776486[P]. 20040817.
[15] Y W KWON, H C BANG. The finite element method using matlab(2015).