Method for calculating a customized progressive addition surface; method for manufacturing a progressive addition lens
US8408700B2 · kind B2 · utility
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16Claims
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Key dates
| Filing date | Jun 11, 2009 |
| Grant date | Apr 2, 2013 |
| Priority date | — |
| Expiry date | Sep 22, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/028
- WIPO fieldOptics
- WIPO sectorInstruments
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″.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.