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US 6,786,600 B2Granted
Methods for generating a progressive surface and for production of multifocal progressive lenses
AssigneeShamir Optical Industry Ltd.
InventorsDan Katzman, Yuval Carmon
Life of this patent
Estimating the term…
Abstract
A method for generating a progressive surface includes generating the surface from stored delta data and a substantially spherical surface calculated on-the-fly.
Claims10
A method comprising:
- subtracting a designed multifocal progressive surface from a substantially spherical surface to obtain a set of difference data;
- and
- determining a range of radii of curvature values to associate with said set of difference data.
A method comprising:
- subtracting a substantially spherical surface from a designed multifocal progressive surface to obtain a set of difference data;
- and
- determining a range of radii of curvature values to associate with said set of difference data.
A method comprising:
- obtaining a prescription or a multifocal progressive lens, said prescription including a prescribed optical power of a far-vision region of said multifocal progressive lens and a prescribed addition;
- generating a first substantially spherical surface whose radius of curvature is such that were said first substantially spherical surface to form a single-vision lens with a second substantially spherical surface, said single-vision lens would have an optical power substantially equivalent of said prescribed optical power;
- identifying a set of difference data associated with said radius of curvature and said prescribed addition;
- and
- generating a multifocal progressive surface by combining said set of difference data and said first substantially spherical surface.
2 more elements
Dependencies are inferred from the claim text.