Patent ID: 8197727

Claim:
A method of manufacturing a formed article, wherein the formed article is a casting mold or a portion of a casting mold for the manufacture of a progressive dioptric power eyeglass lens, the method comprising: positioning a forming material comprising a thermosoftening substance on a forming surface of a mold, wherein the forming material has an upper surface and a lower surface, and the forming surface of the mold has a free-form shape; and heating the forming material to a temperature permitting deformation, resulting in bringing the lower surface of the forming material into tight contact with the forming surface, whereby the upper surface of the forming material is formed into a free-form optical surface to form the casting mold or a portion of the casting mold for the manufacture of a progressive dioptric power eyeglass lens; wherein the forming is conducted while an exposed portion on the forming surface side of the mold upon which the forming material has been positioned is covered with a covering member; and the mold has through-holes having a diameter in the range of 0.3 to 0.5 mm and the through-holes are provided such that positions corresponding to reference points for measurement of a dioptric power of the progressive dioptric eyeglass lens on the lower surface of the forming material do not overlap openings on the forming surface side when the forming surface and the lower surface of the forming material are brought into tight contact.