B-spline optimization of optical glasses especially spectacle glasses with planes of symmetry
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United States of America Patent
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Dec 13, 2005
Grant Date -
Jun 17, 2004
app pub date -
Feb 12, 2002
filing date -
Feb 12, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for optimizing an atoroidal surface of an optical lens, in particular a spectacle lens, having at least one plane of symmetry is characterized by a combination of the following features: dividing the atoroidal surface having at least one plane of symmetry into at least two regions separated by the at least one plane of symmetry; representing one of the separate regions (represented region) of this surface by a set of coefficients of B spline functions; computing sagittal heights of the represented region by B spline interpolation; computing sagittal heights in at least one other region by mirroring coefficients or coordinates at the at least one plane of symmetry; and optimizing the atoroidal surface only by varying the set of B spline coefficients of the represented region.
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