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

Claim 20:
21. The product as claimed in claim 15, wherein the progressive power spectacle lens further comprises an intermediate corridor, wherein
(i) the front surface is configured as the freeform surface, wherein the mean curvature has a maximum in the intermediate corridor, and/or
(ii) the back surface is configured as the freeform surface, wherein the mean curvature has a minimum in the intermediate corridor, or
(iii) the back surface has a spherical, rotationally symmetrically aspheric, or toric surface geometry and the front surface is configured as the freeform surface, wherein the maximum of the absolute value of the mean curvature of the front surface is in the intermediate corridor, or
(iv) the front surface has a spherical, rotationally symmetrically aspheric, or toric surface geometry and the back surface is configured as the freeform surface, wherein the minimum of the absolute value of the mean curvature of the back surface is in the intermediate corridor, or
(v) the back surface is not configured as the freeform surface and the front surface is configured as the freeform surface, wherein the maximum of the absolute value of the mean curvature of the front surface is in the intermediate corridor, or
(vi) the front surface is not configured as the freeform surface and the back surface is configured as the freeform surface, wherein the minimum of the absolute value of the mean curvature of the back surface is in the intermediate corridor.