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자료유형
학술저널
저자정보
저널정보
한국광학회 Current Optics and Photonics Current Optics and Photonics Vol.1 No.5
발행연도
2017.10
수록면
538 - 543 (6page)

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Progressive addition lenses (PAL) have very wide application in the modern glasses market. The uniqueprogressive surface can make a lens have progressive refractive power, which can meet the human eye’sdifferent 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 than0.1D over the lens effective area. The optical power distribution of PAL is determined directly by thesurface. Consequently, the surface processing accuracy requirement is proposed. Beginning from the surfaceexpressions of progressive addition lenses, the relationship equations between the surface sag and opticalpower distribution are derived. They are demonstrated through tolerance analysis and test of an exampleprogressive addition lens with addition of 2.09D (5.46D-7.55D). The example addition surface is fabricatedunder given accuracy by a single-point diamond ultra-precision machine. The optical power of the PALexample is tested with a focal-meter after fabrication. The optical power addition difference between testresult and design nominal value is 0.09D, which is less than 0.1D. The derived relationship between thesurface error and optical power is verified from the PAL example simulation and test result. It can providetheoretical tolerance analysis proof for the PAL surface fabricating process.

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