The present invention relates to a spectacle lens having a substrate and a functional coating arranged as the outermost layer on the substrate, wherein the functional coating imparts to the spectacle lens a haptic smoothness coefficient HGK of at most 0.28, preferentially at most 0.25, and/or a haptic smoothness coefficient R_HGK of at most 0.85, preferentially at most 0.80. The present invention furthermore relates to a measurement method for determining the smoothness of a spectacle lens, which is expressed by the haptic smoothness coefficient HGK and/or the haptic smoothness coefficient R_HGK, as well as to a method for producing the spectacle lens.