Automatic modification of a progressive lens design

摘要

A method and apparatus for creating a progressive spectacle lens design by transforming a starting design. The starting design is defined to include specifications for the course of a principal line and specification of at least one base target isoastigmatism line with a constant base target astigmatism, in which the base target isoastigmatism line passes through a first predetermined control point {right arrow over (r)}1=(u1,y1). The method and apparatus transform the starting design by shifting the first control point {right arrow over (r)}1=(u1,y1) along a predetermined or predeterminable curve, taking into account the design and/or the spectacle lens wearer-specific data; modifying the course of the base target isoastigmatism line such that it passes through the shifted first control point {right arrow over (r)}′1(u′1,y′1); and calculating a target astigmatism distribution A(u,y), which exhibits the modified base target isoastigmatism line. Furthermore, the method and apparatus are provided to create the spectacle lens on the basis of the progressive spectacle lens design.

主权项

1. A method for creating a progressive spectacle lens design comprising:
defining a starting design that comprises specifications for the course of a principal line and specification of at least one base target isoastigmatism line with a constant base target astigmatism, wherein the base target isoastigmatism line passes through at least a first predetermined control point {right arrow over (r)}1=(u1,y1), the at least one base target isoastigmatism line includes a base target isoastigmatism line on the nasal side of the spectacle lens and a base target isoastigmatism line on the temporal side of the spectacle lens, each of the base target isoastigmatism lines passing through its corresponding first control point, each course of base target isoastigmatism line being transformed such that is passes through the respective shifted first control point in the step of modifying the course of the basr target isoastigmatism line; shifting the first contril point {right arrow over (r)}1=(u1,y1)along a predetermined or predeterminable curve, taking into account at least one of design and spectacle lens wearer-specific data; modifying the course of the base target isoastigmatism line such that it passes through the shifted first control point {right arrow over (r)}1(u′1,y′1); calculating a target astigmatism distribution A(u,y), which exhibits the modified base target isoastigmatism line, wherein: x designates the horizontal coordinate, y designates the vertical coordinate, and u designates the horizontal distance of a point (x,y) from the principal line, and wherein the target astigmatism in the base target isoastigmatism line has a value which is between 0.125 and 1.0 diopteers.