Title:
両面プログレッシブ眼鏡レンズの特性表示及び最適化の方法
Document Type and Number:
Japanese Patent JP2004522182
Kind Code:
A
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.
Inventors:
Werk andrea
Baumbach. Peter
Heimar Walter
Pfeiffer. Herbert
Esser. Gregor
Altheimer Helmut
Baumbach. Peter
Heimar Walter
Pfeiffer. Herbert
Esser. Gregor
Altheimer Helmut
Application Number:
JP2002562006A
Publication Date:
July 22, 2004
Filing Date:
February 04, 2002
Export Citation:
Assignee:
Rodenstock. Gezel Shaft. Mitt. Beschlenktel. Haftung
International Classes:
G02C7/02; (IPC1-7): G02C7/02
Domestic Patent References:
| JP2000155294A | 2000-06-06 |
Foreign References:
| WO1997019383A1 | 1997-05-29 |
Attorney, Agent or Firm:
Yoshiteru Oshida