| abstract |
PROBLEM TO BE SOLVED: To provide an episulfide-based lens using an episulfide compound as a raw material, to prevent yellowing of the obtained lens, and to minimize the change in hue of the lens due to the influence of heat, light and the like. To provide a method for manufacturing a lens, which has a good quality. SOLUTION: In the production of an episulfide lens obtained by cast polymerization of a polymerizable composition containing a compound having two or more episulfide groups in one molecule, the lens obtained by polymerization is further heated to 100 ° C. A method for producing a lens, comprising performing a reheating treatment under a temperature condition of 130 ° C. and a heating time of 1 to 12 hours. |