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

Claim 31:
32. A spectacle lens comprising:
a substrate;
a photochromic layer arranged on the substrate;
a barrier layer, a chemically modified primer coat layer, or the barrier layer and the chemically modified primer coat layer, wherein the barrier layer and/or the chemically modified primer coat layer are arranged on a same side of the substrate as the photochromic layer and jointly form a first surface of the spectacle lens,
wherein the spectacle lens, in an event of damaging the spectacle lens by scratching the first surface of the spectacle lens with a scoring tool with a force of ≤65 mN, exhibits no swelling after complete contamination of the damaged first surface of the spectacle lens with a liquid, saturated or unsaturated, optionally substituted, monocarboxylic acid over a period of from 12 hours to 84 hours at room temperature,
wherein no swelling is defined as no structure of a size of ≥500 nm in z direction of the first surface of the spectacle lens is formed after the complete contamination, as seen with an optical profilometer based on white light interferometry, and
wherein
a) the at least one photochromic layer,
b) at least one acrylate-epoxy layer,
c) at least one primer coat layer and
d) at least one hardcoat layer,
are arranged on the substrate, and
wherein, remotely from the substrate, the at least one acrylate-epoxy layer is disposed closest to the at least one photochromic layer and the at least one hardcoat layer furthest removed from the at least one photochromic layer.