Patent ID: 8382932

Claim:
A method for blocking a lens blank having a blocking face of pre-determined curvature, said method comprising the steps of: (a) providing a plurality of lens blocks each comprising a lens mounting face that has a pre-determined block curve, wherein said lens blocks all have the same block curve; (b) taking out one of said lens blocks of said plurality of lens blocks; (c) mixing an adhesive composition comprising in an un-polymerized state a liquid adhesive curable by UV or visible light and a filler as a non polymerizing solid; (d) applying to at least one of said blocking face of said lens blank and said lens mounting face of said lens block said adhesive composition; (e) urging said lens blank toward said lens block with said blocking face of said lens blank facing said lens mounting face of said lens block; (f) generating UV or visible light and transmitting the light to said adhesive composition, said light being of a wavelength and an intensity and applied for a time interval sufficient to cause setting of said adhesive composition; (g) wherein said filler substantially comprises solid particles having a particle size that is equal to or less than 1 mm and wherein a mixing ratio of said adhesive and said filler is selected to have a dimensional change and exothermic heat of polymerization of said adhesive composition upon setting low enough so that the adhesive composition is capable of setting without imparting undue stresses on said lens blank and without de-bonding of said lens blank from said adhesive composition; and (h) wherein said filler is a plastic material wherein the plastic material is Polycaprolactone, Terpolymer derived from Ethyl-Methyl-Acrylate-Acrylic Acid, or the filler is UV or visible light cured adhesive in a reground state.