Eyeglass lens

An eyeglass lens prepared using a resin composition containing m-xylylene diisocyanate, a polythiol compound, and an ultraviolet absorber, wherein the ultraviolet absorber contains at least a compound represented by formula (1) and a compound represented by formula (2) and the M value represented by formula (X) is greater than 1.40 but less than 3.20:

• (wherein in formula (1), R1-R9 each independently represent a hydrogen atom, an alkyl group, an alkoxy group, or a hydroxyl group;
• in formula (2), R11-R18 each independently represent a hydrogen atom, an alkyl group, an alkoxy group, or a hydroxyl group or a halogen atom, 1019 represents a hydrogen atom, an alkyl group, an alkoxy group, or a phenylalkyl group or a group represented by the following formula (3);
• however, if R19 is a hydrogen atom, an alkyl group, or an alkoxy group, at least one of R11-R14 is a halogen atom;
• *-L-R20 Formula (3)
• wherein in formula (3), L represents an alkylene group;
• R20 represents an optionally substituted aromatic hydrocarbon group or heterocyclic ring group;
• and
• M value=[λ2−λ1]×(A2/A1)×(W2/W1) Formula (X)
• wherein in formula (X),
• λ1 represents the maximum absorption wavelength of a compound represented by formula (1) in the ultraviolet-visible absorption spectrum of a chloroform solution in which the concentration of a compound represented by formula (1) is 10 weight ppm;
• λ1 represents the maximum absorption wavelength of a compound represented by formula (2) in the ultraviolet-visible absorption spectrum of a chloroform solution in which the concentration of a compound represented by formula (2) is 10 weight ppm;
• A1 represents the absorbance at the maximum absorption wavelength of a compound represented by formula (1) in the ultraviolet-visible absorption spectrum of a chloroform solution in which the concentration of a compound represented by formula (1) is 10 weight ppm;
• A2 represents the absorbance at the maximum absorption wavelength of a compound represented by formula (2) in the ultraviolet-visible absorption spectrum of a chloroform solution in which the concentration of a compound represented by formula (2) is 10 weight ppm;
• W1 represents the amount (in parts by weight) of a compound represented by formula (1) when the total of the m-xylylene diisocyanate and the polythiol compound is 100 parts by weight;
• and
• W2 represents the amount (in parts by weight) of a compound represented by formula (1) when the total of the m-xylylene diisocyanate and the polythiol compound is 100 parts by weight.