Lens for spectacles and spectacles

1. A lens for spectacles comprising:

a resin; and

a single coloring agent having both a maximum absorption wavelength in a methanol solution in a range of 480 nm to 500 nm and a half-width of an absorption peak in a methanol solution of 10 nm or more and less than 40 nm.

2. The lens for spectacles according to claim 1 ,

wherein the single coloring agent is a methine coloring agent.

3. The lens for spectacles according to claim 1 ,

wherein the single coloring agent is an oxonol coloring agent.

4. The lens for spectacles according to claim 3 ,

wherein the oxonol coloring agent is represented by General Formula (1):

A 1 =L 1 -L 2 =L 3 -A 2 nM +   (1)

in General Formula (1), A 1 represents a keto form of an acidic nucleus selected from the group consisting of General Formulae (1-a) to (1-x); A 2 represents an enol form of an acidic nucleus selected from the group consisting of General Formulae (1-a) to (1-x), wherein a hydroxyl group in the enol form may be dissociated;

L 1 , L 2 , and L 3 each independently represent a methine group which may be substituted; and

M + represents a hydrogen atom or a monovalent counter cation, and n represents the number required to make a positive charge number of M equal to a negative charge number of A 1 =L 1 -L 2 =L 3 -A 2 ;

in General Formulae (1-a) to (1-x), each * represents a position at which the keto form A 1 of the acidic nucleus is bonded to L 1 and the enol form A 2 of the acidic nucleus is bonded to L 3 ; and

X represents an oxygen atom or a sulfur atom; Y represents an electron-withdrawing group; Z represents a hydrogen atom, a carbamoyl group, an alkyl group, an aryl group, a cyano group, a carboxyl group, an acyl group, an alkyloxycarbonyl group, an aryloxycarbonyl group, a halogen atom, an amino group, an acylamino group, an alkylsulfonyl group, an arylsulfonyl group, or a sulfo group; and R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 each independently represent a hydrogen atom or a monovalent substituent.

5. The lens for spectacles according to claim 4 ,

wherein in General Formula (1), A 1 represents a keto form of an acidic nucleus selected from the group consisting of (1-b), (1-c), and (1-q), and A 2 represents an enol form of an acidic nucleus selected from the group consisting of (1-b), (1-c), and (1-q).

6. The lens for spectacles according to claim 2 ,

wherein the methine coloring agent is represented by General Formula (2):

in General Formula (2), M + represents a hydrogen atom or a monovalent counter cation.

7. The lens for spectacles according to claim 1 ,

wherein the single coloring agent is kneaded into the resin.

8. The lens for spectacles according to claim 1 , further comprising an ultraviolet absorbing agent selected from the group consisting of a benzotriazole compound and a triazine compound.

9. Spectacles comprising the lens for spectacles according to claim 1 .