| abstract |
According to the invention, a composition for an optical material containing the episulfide compound (A), the polythiol compound (B), and the photochromic compound (C) can be provided. The aspect in which the above-mentioned episulfide compound (A) is a compound represented by the following formula (1) or the above-mentioned polythiol compound (B) is a compound represented by the following formula (6) is preferred. □ (In the formula (1), m is an integer of 0 to 4, and n is an integer of 0 to 2.) □ (in the formula (6), n is an integer of 4 to 20. R1 and R2 may be the same or different , represents H, SH, an alkyl group having 1 to 10 carbon atoms, or an alkylthiol group having 1 to 10 carbon atoms.) |