Method of providing refractive microstructures on a surface of a spectacle lens and spectacle lens design

A method of providing refractive microstructures on a surface of a spectacle lens body in which the refractive microstructures are formed on the surface by an additive manufacturing process, in which the refractive microstructures are formed by applying a curable material selected from the group consisting of a liquid or viscous curable material and curing the curable material,

• wherein the additive manufacturing process comprises:
• forming a layer of a first curable material of the curable material;
• applying an additional amount of the first curable material or an amount of a second curable material of the curable material at locations at which the refractive microstructures shall be formed before curing or pinning the layer of the first curable material to form protrusions with an initial curvature prior to the curing or pinning;
• flattening the initial curvature by a material transport process;
• commencing curing or pinning of the layer of the first curable material with the additional amount of the first curable material or with the amount of the second curable material after the protrusions are initially formed while the initial curvature flattens and before the protrusions have completely coalesced by material transport processes within the liquid or viscous material in the layer of the first curable material;
• controlling a time until the pinning or curing starts and the time given for pinning or curing the material of the layer of the first curable material and the protrusions;
• and
• finally forming the refractive microstructures by achieving a final curvature of the protrusions as a flattened curvature by stopping a flattening of the curvature by a controlled increase in viscosity of the curable material, the initial curvature being greater than the final curvature.

A method of providing refractive microstructures on a surface of a spectacle lens body in which the refractive microstructures are formed on the surface by an additive manufacturing process, in which the refractive microstructures are formed by applying a curable material selected from the group consisting of a liquid or viscous curable material and curing the curable material, wherein the additive manufacturing process comprises:

• forming a layer of a first curable material of the curable material;
• applying an additional amount of the first curable material or an amount of a second curable material of the curable material at locations at which the refractive microstructures shall be formed before curing or pinning the layer of the first curable material to form protrusions with an initial curvature prior to the curing or pinning;
• flattening the initial curvature by a material transport process;
• commencing curing or pinning of the layer of the first curable material with the additional amount of the first curable material or with the amount of the second curable material after the protrusions are initially formed while the initial curvature flattens and before the protrusions have completely coalesced by material transport processes within the liquid or viscous material in the layer of the first curable material;
• and
• finally forming the refractive microstructures by achieving a final curvature of the protrusions as a flattened curvature by stopping the material transport processes by a controlled increase in viscosity of the curable material, the initial curvature being greater than the final curvature.