[Claim 1]
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`Claims
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`An eyeglass lens prepared using a resin composition comprising at least one isocyanate
`
`compound selected from a group consisting of 2,5-bis(isocyanatomethyl)bicyclo[2.2.1]heptane
`
`and 2,6-bis(isocyanatomethyl)bicyclo[2.2.1]heptane, a polythiol compound, an ultraviolet
`
`absorber represented by formula (1), and an ultraviolet absorber represented by formula (2),
`
`wherein the eyeglass lens has an M value represented by the following formula (X) greater
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`than 0.7 and less than 16.7.
`
`[Structure 1]
`
`1T1
`2
`R \\ /_{/\
`I
`
`3/
`
`R
`
`\\\_
`T
`R4
`
`fee
`Rf
`jN\
`>‘:\
`/N—<\
`”9R7
`\
`//
`I/‘—\
`R9
`R8
`
`sub,
`
`Formula (1)
`
`R‘l’l
`
`.
`
`\ _/ \
`/
`REN
`
`N
`
`~
`‘
`
`\
`[M4216
`//
`’/
`
`Formula (2)
`
`\
`R13/ \-\
`Rn
`R48
`T
`(ln 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, R19
`
`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.
`
`Formula (3) *-L-R20
`
`|n formula (3), L represents an alkylene group. R20 represents an optionally substituted
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`aromatic hydrocarbon group or heterocyclic group.)
`
`Formula (X) M value =|A2-A1|x(AZ/A1)X(A2(4oo)/A1(4oo))X(W2/W1)
`
`(ln formula (X),
`
`A1 represents the maximum absorption wavelength of an ultraviolet absorber represented by
`
`formula (1) in the ultraviolet-visible absorption spectrum of a chloroform solution in which the
`
`concentration of an ultraviolet absorber represented by formula (1) is 10 weight ppm.
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`27
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`
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`A2 represents the maximum absorption wavelength of an ultraviolet absorber represented by
`
`formula (2) in the ultraviolet-visible absorption spectrum of a chloroform solution in which the
`
`concentration of an ultraviolet absorber represented by formula (2) is 10 weight ppm.
`
`A1
`
`represents the absorbance at
`
`the maximum absorption wavelength of an ultraviolet
`
`absorber represented by formula (1)
`
`in the ultraviolet-visible absorption spectrum of a
`
`chloroform solution in which the concentration of an ultraviolet absorber represented by
`
`formula (1) is 10 weight ppm.
`
`A2 represents the absorbance at
`
`the maximum absorption wavelength of an ultraviolet
`
`absorber represented by formula (2)
`
`in the ultraviolet-visible absorption spectrum of a
`
`chloroform solution in which the concentration of an ultraviolet absorber represented by
`
`formula (2) is 10 weight ppm.
`
`A1(4oo) represents the absorbance at 400 nm in the ultraviolet-visible absorption spectrum of a
`
`chloroform solution in which the concentration of an ultraviolet absorber represented by
`
`formula (1) is 10 weight ppm.
`
`A2(4oo) represents the absorbance at 400 nm in the ultraviolet-visible absorption spectrum of a
`
`chloroform solution in which the concentration of an ultraviolet absorber represented by
`
`formula (2) is 10 weight ppm.
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`W1 represents the amount (in parts by weight) of an ultraviolet absorber represented by
`
`formula (1) when the total of the isocyanate compound and the polythiol compound is 100
`
`parts by weight.
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`W2 represents the amount (in parts by weight) of an ultraviolet absorber represented by
`
`formula (2) when the total of the isocyanate compound and the polythiol compound is 100
`
`parts by weight.)
`
`[Claim 2]
`
`The eyeglass lens as claimed in claim 1, wherein the sum of W1 and W2 is 0.1 parts by weight
`
`or more.
`
`[Claim 3]
`
`The eyeglass lens as claimed in claim 1 or 2, wherein the M value is greater than 0.7 and less
`
`than 10.1.
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`28
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`[Claim 4]
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`The eyeglass lens as claimed in any one of claims 1-3, wherein the ultraviolet absorber
`
`represented by formula (2) is represented by the following formula (4).
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`[Structure 2]
`
`R55
`
`L—R5O
`
`N
`
`R56
`
`(4)
`
`R58
`
`R57
`
`(In formula (4), R51-R58 each independently represent a hydrogen atom, an alkyl group, an
`
`alkoxy group, or a hydroxyl group, L represents an alkylene group, R50 represents an
`
`optionally substituted aromatic hydrocarbon group or a heterocyclic group.)
`
`[Claim 5]
`
`The eyeglass lens according to any one of claims 1-4, wherein the sum of W1 and W2 is 3.0
`
`parts by weight or more.
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