One embodiment according to the present disclosure relates to a monomer for an optical component, including: a compound represented by the formula (1), in which a total value P1 of peak areas at retention times before the main peak in measurement through gel permeation chromatography is 3.5% or less of a total value P2 of all peak areas.

##STR00001##

One embodiment according to the present disclosure relates to a monomer for an optical component, including: a compound represented by the formula (1), in which a total value P1 of peak areas at retention times before the main peak in measurement through gel permeation chromatography is 3.5% or less of a total value P2 of all peak areas.

##STR00001##

An episulfide compound and an optical material composition thereof are provided. The episulfide compound possesses a sulfoxide structure, and the presence of the polar group can effectively improve the alkali corrosion resistance of optical material substrates and reduce the rate of substrate burn, thereby improving substrate yield and reducing production costs.

An episulfide compound and an optical material composition thereof are provided. The episulfide compound possesses a sulfoxide structure, and the presence of the polar group can effectively improve the alkali corrosion resistance of optical material substrates and reduce the rate of substrate burn, thereby improving substrate yield and reducing production costs.