A polymerizable composition for a polythiourethane-based lens, which comprises: an isocyanate compound and a polythiol composition, wherein the polythiol composition comprises: a polythiol compound, and a photoactive color correcting agent, wherein the photoactive color correcting agent comprises the compound represented by the following Formula 1: wherein R 1 is C 1-10 alkyl, C 1-10 alkoxy, phenyl, or C 1-10 alkyl substituted with a halogen, X is C 1-10 alkyl, C 1-10 alkoxy, nitro substituted with a halogen, C 1-20 dialkylamino, or cyano, l and m are each independently 1 or 2, l + m = 3, and n is an integer of 0 to 3, wherein when l is 2, R 1 may be the same as, or different from, each other, and when n is 2 or 3, X may be the same as, or different from, each other, wherein the first yellow index of the polythiourethane-based resin formed by thermally curing the polymerizable composition is greater than the second yellow index after the polythiourethane-based resin is irradiated with ultraviolet rays and wherein the difference between the first yellow index and the second yellow index is at least 0.11, and wherein b* of the polythiol composition is 2.0 or more, when the polythiol composition is represented by the L*a*b* color space. an isocyanate compound and a polythiol composition, wherein the polythiol composition comprises: a polythiol compound, and a photoactive color correcting agent, wherein the photoactive color correcting agent comprises the compound represented by the following Formula 1: wherein R 1 is C 1-10 alkyl, C 1-10 alkoxy, phenyl, or C 1-10 alkyl substituted with a halogen, X is C 1-10 alkyl, C 1-10 alkoxy, nitro substituted with a halogen, C 1-20 dialkylamino, or cyano, l and m are each independently 1 or 2, l + m = 3, and n is an integer of 0 to 3, wherein when l is 2, R 1 may be the same as, or different from, each other, and when n is 2 or 3, X may be the same as, or different from, each other, wherein the first yellow index of the polythiourethane-based resin formed by thermally curing the polymerizable composition is greater than the second yellow index after the polythiourethane-based resin is irradiated with ultraviolet rays and wherein the difference between the first yellow index and the second yellow index is at least 0.11, and wherein b* of the polythiol composition is 2.0 or more, when the polythiol composition is represented by the L*a*b* color space. a polythiol compound, and a photoactive color correcting agent, wherein the photoactive color correcting agent comprises the compound represented by the following Formula 1: wherein R 1 is C 1-10 alkyl, C 1-10 alkoxy, phenyl, or C 1-10 alkyl substituted with a halogen, X is C 1-10 alkyl, C 1-10 alkoxy, nitro substituted with a halogen, C 1-20 dialkylamino, or cyano, l and m are each independently 1 or 2, l + m = 3, and n is an integer of 0 to 3, wherein when l is 2, R 1 may be the same as, or different from, each other, and when n is 2 or 3, X may be the same as, or different from, each other, wherein the first yellow index of the polythiourethane-based resin formed by thermally curing the polymerizable composition is greater than the second yellow index after the polythiourethane-based resin is irradiated with ultraviolet rays and wherein the difference between the first yellow index and the second yellow index is at least 0.11, and wherein b* of the polythiol composition is 2.0 or more, when the polythiol composition is represented by the L*a*b* color space. <EOS>