Patent ID: 11892712
Assignee: CARL ZEISS VISION INTERNATIONAL GMBH
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 40:
41. A computer having a processor and a non-transitory memory in which a computer program as claimed in claim 37 is stored, the computer being configured to carry out a method comprising:
calculating optical properties of the progressive power spectacle lens with a ray tracing method at a plurality of evaluation points, at which visual rays pass through the progressive power spectacle lens;
setting at least one intended optical property for the progressive power spectacle lens at the respective evaluation point;
setting a design for the progressive power spectacle lens, wherein the design includes a representation of a local surface geometry of the progressive surface and a local refractive index of the progressive power spectacle lens in the respective visual beam path through the evaluation points;
modifying the design of the progressive power spectacle lens in view of an approximation of the at least one intended optical property of the progressive power spectacle lens, wherein the modifying includes modifying the representation of the local surface geometry of the progressive surface and the local refractive index of the progressive power spectacle lens in the respective visual beam path through the evaluation points, wherein the at least one intended optical property includes an intended residual astigmatism of the progressive power spectacle lens, wherein the progressive surface and the local refractive index are modified according to at least one of the specifications from the following group of specifications:
(i) the progressive surface is modified freely in two spatial dimensions and the local refractive index is modified freely in at least two spatial dimensions,
(ii) the progressive surface is modified freely in one or in two spatial dimensions and the local refractive index is modified freely in three spatial dimensions,
(iii) the progressive surface is modified freely in two spatial dimensions and the local refractive index is modified freely in two spatial dimensions, and
(iv) the progressive surface is modified freely in two spatial dimensions and the local refractive index is modified freely in three spatial dimensions.