| abstract |
An optical element (10), in particular a spectacle lens or a spectacle lens blank, has a substrate body (12) made of a plastic, which is preferably transparent in the visible spectral range, and a coating (15) comprising a plurality of layers (14, 16, 18) comprises hardcoat layer 14 adjacent to the substrate body (12). According to the invention, the coating (15) has a diffusivity D F which comprises taking up water molecules passing through the coating (15) in the substrate body (12) and releasing water molecules from the substrate body (12) through the coating (15) on the side facing away from the substrate body (12) of the coating (15) arranged air atmosphere with a moisture flow density j D guaranteed, based on the equilibrium state of the amount in the substrate body (12) in an air atmosphere at 23 ° C and 50% relative humidity embedded Water molecules, the setting of the equilibrium state of the amount of stored in the substrate body (12) in an air atmosphere at 40 ° C and 95% relative humidity causes water molecules within a time interval, by no more than a period of time .DELTA.t = 10h, preferably not more as a period of time Δt = 9h or Δt = 8h or Δt = 7h or .DELTA.t = 6h or .DELTA.t = 5h or .DELTA.t = 4h or .DELTA.t = 3h or .DELTA.t = 2h, more preferably by not more than a period of time .DELTA.t = 1h longer than that for setting this state of equilibrium under appropriate conditions at a to the substrate body (12) identical uncoated substrate body required time interval. |