Patent ID: 11874534
Assignee: CARL ZEISS VISION INTERNATIONAL GMBH
Field: Optics (Instruments)
Classification: CPC G  B | IPC G

Claim 42:
43. A spectacle lens comprising at least one substrate and at least one photochromic layer, wherein the spectacle lens comprises, in each case on the same surface also comprising the at least one photochromic layer, at least one barrier layer and/or at least one chemically modified layer, and at least the same one of the surfaces of the substrate comprises
a) at least one photochromic layer,
b) at least one acrylate-epoxy layer and
c) at least one hardcoat layer,
wherein the at least one acrylate-epoxy layer and the at least one hardcoat layer are disposed remote from the substrate in relation to the at least one photochromic layer, the at least one hardcoat layer is disposed furthest remote from the substrate in relation to the at least one photochromic layer, and the spectacle lens, in the event of at least one instance of damage by scratching with a scoring tool to the surface of the spectacle lens comprising at least one photochromic layer with a force of ≤65 mN, after complete contamination of the damaged surface of the spectacle lens comprising at least one photochromic layer with at least one organic acid selected from a liquid organic aliphatic saturated or unsaturated, optionally substituted, monocarboxylic acid, has no swelling of the coating and/or the substrate over a period from a range from 12 hours to 84 hours at room temperature, wherein, in the case of no swelling, it is not possible with the aid of an optical profilometer based on white light interferometry to see any structures of ≥500 nm in z direction on the surface of the spectacle lens comprising at least one photochromic layer.