Patent ID: 8888280
Filing Date: 2014-11-18
Classification: G02C

Abstract:
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)} shifting the first contril point {right arrow over (r)} modifying the course of the base target isoastigmatism line such that it passes through the shifted first control point {right arrow over (r)} 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.