Method for calculating a customized progressive addition surface; method for manufacturing a progressive addition lens
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United States of America Patent
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Apr 2, 2013
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app pub date -
Jun 11, 2009
filing date -
Jun 12, 2008
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Abstract
A method for calculating a customized progressive addition surface S′″ of a progressive addition lens (PAL) made of a material having an optical index of n, the method, comprising at least the successive steps of: a) providing N initial progressive addition surfaces where N≧1, b) calculating N intermediate surfaces S′k by flattening each initial progressive addition surfaces Sk, c) calculating a transformed intermediate surface S″, d) calculating the customized progressive addition surface S′″ by cambering the transformed intermediate surface S″.
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