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

Claim 41:
42. A spectacle lens comprising at least one substrate and at least one photochromic layer, wherein at least one of the surfaces of the substrate comprises the at least one photochromic layer and, remotely from the substrate, at least one ultrathin lens having an average thickness from a range from 19 μm to 230 μm on the same surface of the substrate, wherein the ultrathin lens prevents pH-acidic components from coming into contact with the at least one photochromic layer, such that, 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, there is no occurrence of 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.