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

Claim 14:
15. A product comprising:
(i) a progressive power spectacle lens or (ii) a representation of the progressive power spectacle lens having instructions for the production thereof using an additive method, the representation being stored on a non-transitory data medium as computer-readable data, or (iii) the non-transitory data medium having a virtual representation of the progressive power spectacle lens as computer-readable data and having instructions for the production thereof using an additive method, wherein the progressive power spectacle lens has:
a front surface;
a back surface; and
a spatially varying refractive index,
wherein at least one of the front surface or the back surface is configured as a freeform surface, the freeform surface being configured as a progressive surface,
wherein the progressive power spectacle lens is made of a substrate having no individual layers and having the front surface, the back surface, and the spatially varying refractive index,
wherein the substrate has at least one of a front surface coating including one or more individual layers or a back surface coating including one or more individual layers,
wherein a difference between the spherical equivalent measured at each point on the front surface of the progressive power spectacle lens with the at least one of the front surface coating or the back surface coating and the spherical equivalent measured at each corresponding point on the front surface of a comparison progressive power spectacle lens without the front surface coating and without the back surface coating but with an identical substrate is less than a value from the group specified below:
(a) the difference value is less than 0.001 dpt
(b) the difference value is less than 0.002 dpt
(c) the difference value is less than 0.003 dpt
(d) the difference value is less than 0.004 dpt

and wherein
(b) the refractive index varies in a first spatial dimension and in a second spatial dimension and in a third spatial dimension, wherein the 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.