Abstract

Progressive addition lenses (PAL) have very wide application in the modern glasses market. The unique progressive surface can make a lens have progressive refractive power, which can meet the human eye’s different needs for distance-vision and near-vision. According to the national glasses fabrication standard, the difference between actual optical power after fabrication and nominal design value should be less than 0.1D over the lens effective area. The optical power distribution of PAL is determined directly by the surface. Consequently, the surface processing accuracy requirement is proposed. Beginning from the surface expressions of progressive addition lenses, the relationship equations between the surface sag and optical power distribution are derived. They are demonstrated through tolerance analysis and test of an example progressive addition lens with addition of 2.09D (5.46D-7.55D). The example addition surface is fabricated under given accuracy by a single-point diamond ultra-precision machine. The optical power of the PAL example is tested with a focal-meter after fabrication. The optical power addition difference between test result and design nominal value is 0.09D, which is less than 0.1D. The derived relationship between the surface error and optical power is verified from the PAL example simulation and test result. It can provide theoretical tolerance analysis proof for the PAL surface fabricating process.

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  15. http://www.bocinstruments.com.au/persistent/catalogue-files/products/lm1800pd1800pe4p4k.pdf

Other (15)

J. E. Gwiazda and L. HymanAccomodation and related risk factors associated with myopia progression and their interaction with treatment in COMET childrenInvest. Ophthalmol. Vis. Sci.20044521432151

D. R. PopeProgressive addition lenses: history, design, wearer satisfaction and trendsOSA TOPS Vis. Sci. Appl.200035342357

D. A. Berntsen, C. D. Barr, D. O. Mutti, and K. ZadnikPeripheral defocus and Myopia progression in Myopic children randomly assigned to wear single vision and progressive addition lensesInvest. Ophthalmol. Vis. Sci.20135457615770

J. T. WinthropProgressive power spectacle lensesU.S. Patent19925123752

T. Steele, H. McLoughlin, and D. PayneProgressive addition power lensesU.S. Patent6776486 B2

E. V. MenezesProgressive addition lensesU.S. Patent20056883916 B2

R. A. Chipman and P. J. ReardonProgressive addition lensesU.S. Patent20016183084

Y. Tang, Q. Wu, L. Qian, and L. LinOptimizing design for progressive addition lenses by mean curvature flowActa Opt. Sin.2011310522001-10522001-6

J. Wei, F. Wu, and W. ShenDesign and evaluation of progressive addition spectacle lensesOpt. Tech.200329350353

Y. Tang, Q. Wu, X. Chen, H. Zhang, and Y. WuOptimization design of the meridian line of progressive addition lenses based on genetic algorithmActa Opt. Sin.2014340922005-10922005-7

Q. Wu, L. Qian, H. Chen, Y. Wang, and J. YuResearch on meridian lines design for progressive addition lensesActa Opt. Sin.20091131863191

J. T. WinthropProgressive power ophthalmic lenses [P]U.S. Patent19894861153

D. Xue and X. LiProgressive lens design method based on addition power curve transformationOpt. Tech.201238146151

GB 10810.1-2005, Uncut finished spectacle lenses-Part 1: single-vision and multifocal lenses, MOD [S]Chinese standard pressBeijing2005

http://www.bocinstruments.com.au/persistent/catalogue-files/products/lm1800pd1800pe4p4k.pdf

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