Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Reexamination Certificate
2006-04-04
2006-04-04
Sugarman, Scott J. (Department: 2873)
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
C351S169000
Reexamination Certificate
active
07021763
ABSTRACT:
A method for representing and optimizing a double-progressive spectacle lens is characterized by the following steps: selecting a suitable coordinate system K2 for the representation of a back surface; selecting a suitable grid G for the representation of a spline of the back surface of a starting lens to be optimized in a coordinate system K2; assigning sagittal height data of the back surface to a spline (back surface spline); defining a position of a center of rotation of an eye; computing principal rays from the center of rotation of the eye through the starting lens at grid points of G; computing a length of a distance between points of penetration of a thus computed principal ray through a front surface and the back surface (oblique thickness); assigning data of the oblique thickness (thickness spline) to a spline; selecting a set of assessment positions at which an optical quality is computed for a target function; suitably selecting particular optical and geometrical stipulations which ideally should be satisfied at the assessment positions; defining the target function as a deviation of the quality of an actual spectacle lens from ideal values; starting the optimization; evaluating at each one of optimization steps the optical properties in a wearing position at the assessment points by means of surface properties to be computed and actual principal ray data; ending the optimization when the target function is below a particular value, or after a specifiable maximum number of optimization steps.
REFERENCES:
patent: 4952047 (1990-08-01), Barth et al.
patent: 6106118 (2000-08-01), Menezes et al.
patent: 6824268 (2004-11-01), Rubinstein et al.
International Search Report.
Altheimer Helmut
Baumbach Peter
Esser Gregor
Haimerl Walter
Pfeiffer Herbert
Collins Darryl J.
Crowell & Moring LLP
Rodenstock GmbH
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