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

Claim 28:
29. The method as claimed in claim 28, wherein the progressive surface is modified such that a freeform surface arises which has neither point symmetry nor axial symmetry, and
wherein the local refractive index is modified such that:
(a) the refractive index varies only in a first spatial dimension and in a second spatial dimension, and is constant in a third spatial dimension, such that a distribution of the refractive index in the first spatial dimension and the second spatial dimension has neither point symmetry nor axial symmetry, or
(b) the refractive index varies in the first spatial dimension, the second spatial dimension, and the third spatial dimension, such that a distribution of the refractive index in the first spatial dimension and the second spatial dimension in all planes perpendicular to the third spatial dimension has neither point symmetry nor axial symmetry, or
(c) the refractive index varies in the first spatial dimension, the second spatial dimension, and the third spatial dimension, such that a distribution of the refractive index in the progressive power spectacle lens has no point symmetry and no axial symmetry at all.