Spectacle lens

Abstract

The present disclosure addresses the problem of providing a spectacle lens capable of improving contrast sensitivity. The spectacle lens according to the present disclosure has a pigment-dyed lens base material obtained by dyeing a lens base material using a pigment, wherein the difference between the luminous transmittance of the lens base material and the luminous transmittance of the pigment-dyed lens base material is 1.0-4.0%, the difference between the average transmittance in the wavelength range of 530-570 nm of the lens base material and the average transmittance in the wavelength range of 530-570 nm of the pigment-dyed lens base material is 1.0-5.0%, the transmittance of the spectacle lens at a wavelength of 400 nm is 2.0% or less, and the average transmittance of the spectacle lens at a wavelength of 415-440 nm is 40.0-80.0%.

Description

eyeglass lenses

[0001] The present disclosure relates to eyeglass lenses.

[0002] As an example of a spectacle lens, Patent Document 1 discloses a spectacle lens dyed with a specific dye.

[0003] JP 2013-054275 A

[0004] The present disclosure relates to eyeglass lenses according to first to third embodiments.

[0005] 1 shows transmission spectra of the eyeglass lenses of Example 1, Comparative Example 1, and Comparative Example 2.

[0006] The spectacle lenses of the present disclosure according to the first to third embodiments are described in detail below. The spectacle lenses of the present disclosure can improve the contrast sensitivity of a subject when the subject wears the spectacle lenses of the present disclosure.

[0007] In this specification, the word "to" means that the numerical values ​​before and after it are included as the lower and upper limits.

[0008] [First embodiment] A spectacle lens of the first embodiment is a spectacle lens having a dye-dyed lens substrate obtained by dyeing the lens substrate with a dye, wherein the difference (absolute value) between the luminous transmittance of the lens substrate and the luminous transmittance of the dye-dyed lens substrate is 1.0 to 4.0%, the difference (absolute value) between the average transmittance of the lens substrate in a wavelength range of 530 to 570 nm and the average transmittance of the dye-dyed lens substrate in a wavelength range of 530 to 570 nm is 1.0 to 5.0%, the transmittance of the spectacle lens at a wavelength of 400 nm is 2.0% or less, and the average transmittance of the spectacle lens in a wavelength range of 415 to 440 nm is 40.0 to 80.0%.

[0009] In the spectacle lens of the first embodiment, the difference (absolute value) between the luminous transmittance of the lens substrate and the luminous transmittance of the dye-dyed lens substrate is 1.0 to 4.0%, preferably 1.5 to 3.0%, and more preferably 1.5 to 2.5%. The luminous transmittance of the lens substrate is preferably greater than that of the dye-dyed lens substrate. The difference (absolute value) between the average transmittance of the lens substrate in a wavelength range of 530 to 570 nm and the average transmittance of the dye-dyed lens substrate in a wavelength range of 530 to 570 nm is 1.0 to 5.0%, preferably 2.0 to 4.0%, and more preferably 2.5 to 3.5%. The average transmittance of the lens substrate in a wavelength range of 530 to 570 nm is preferably greater than that of the dye-dyed lens substrate in a wavelength range of 530 to 570 nm. The transmittance of the spectacle lens at a wavelength of 400 nm is 2.0% or less, preferably 1.0% or less, and more preferably 0.05% or less. The lower the transmittance at a wavelength of 400 nm, the more preferable (for example, 0% or higher). The average transmittance of the spectacle lens in the wavelength range of 415 to 440 nm is 40.0 to 80.0%, preferably 50.0 to 75.0%, and more preferably 55.0 to 73.0%.

[0010] The luminous transmittance of the spectacle lens is preferably 86.0 to 97.0%, more preferably 89.0 to 94.0%. The average transmittance of the spectacle lens in the wavelength range of 450 to 500 nm is preferably 80.0% or more, more preferably 90.0% or more, and even more preferably greater than 93.0%. The upper limit is preferably 100.0% or less, more preferably 98.0% or less. The average transmittance of the spectacle lens in the wavelength range of 530 to 570 nm is preferably 80.0 to 95.0%, more preferably 85.0 to 93.0%, and even more preferably 90.0 to 93.0%. The average transmittance of the spectacle lens in the wavelength range of 600 to 650 nm is preferably 80.0% or more, more preferably 90.0% or more, and even more preferably greater than 93.0%. The upper limit is preferably 100.0% or less, more preferably 98.0% or less.

[0011] In a spectacle lens, the average transmittance in the wavelength range of 530 to 570 nm is preferably lower than both the average transmittance in the wavelength range of 450 to 500 nm and the average transmittance in the wavelength range of 600 to 650 nm, and it is more preferable that the average transmittance is lower by 2.0% or more (preferably 2.0 to 5.0%, more preferably 3.0 to 5.0%) than both the average transmittance in the wavelength range of 450 to 500 nm and the average transmittance in the wavelength range of 600 to 650 nm.

[0012] The luminous transmittance is a value measured in accordance with T7333:2018. The transmittance and average transmittance are values ​​measured by the following method. A spectrophotometer is used to obtain a transmission spectrum of a measurement object, such as a lens substrate, a dyed lens substrate, or an eyeglass lens, on the optical axis of the measurement object. Specifically, the measurement object is placed in the spectrophotometer, and the transmittance is measured every 5 nm in a wavelength range of 380 to 780 nm to obtain a transmission spectrum. The transmittance is the transmittance at a specific wavelength from the obtained transmission spectrum. The average transmittance is a value calculated by arithmetically averaging the transmittance at each wavelength in 5 nm intervals in a specific wavelength range in the obtained transmission spectrum. For example, the average transmittance in a wavelength range of 530 to 570 nm is the arithmetic average of the transmittance at each wavelength of 530 nm, 535 nm, 540 nm, 545 nm, ..., and 570 nm. Of the optical properties described above, the values ​​of the luminous transmittance, the transmittance, and the average transmittance, other than relative values ​​(e.g., the difference in luminous transmittance and the difference in average transmittance), are values ​​when the center thickness of the object to be measured is 2.0 mm. When the center thickness of the object to be measured is other than 2.0 mm, three or more objects to be measured with different center thicknesses (e.g., thicknesses of 1.0 mm, 3.0 mm, and 5.0 mm) are prepared, and the luminous transmittance, transmittance, and average transmittance of these objects to be measured are measured using the above-described method, and a calibration curve is created showing the relationship between the center thickness of the object to be measured and the luminous transmittance, etc. Using this calibration curve, the converted values ​​when the center thickness of the object to be measured is 2.0 mm are the values ​​shown above. Furthermore, when the eyeglass lens to be measured has a functional layer and the conversion value for that eyeglass lens is calculated using the above-mentioned calibration curve, it is preferable to prepare three or more types of eyeglass lenses that have the same functional layer (same thickness, same components) as the functional layer of the eyeglass lens to be measured, but that differ only in the center thickness of the dye-dyed lens substrate, prepare a calibration curve using those eyeglass lenses, and use that calibration curve to calculate the conversion value when the center thickness of the object to be measured is 2.0 mm.

[0013] Examples of methods for adjusting the optical properties include methods for adjusting the type and content of dyes and the type of lens substrate.

[0014] The thickness of the spectacle lens is preferably 0.8 to 30.0 mm, more preferably 1.0 to 10.0 mm. The thickness of the spectacle lens is the center thickness of the spectacle lens measured using a dial gauge.

[0015] <Dye-dyed lens substrate> The spectacle lens includes a dye-dyed lens substrate. The dye-dyed lens substrate is a substrate obtained by dyeing a lens substrate with a dye, and is a member that supports a functional layer that the spectacle lens may have.

[0016] (Lens substrate) The lens substrate is a substrate in a state before dyeing a dye-dyed lens substrate, and a dye-dyed lens substrate is obtained by dyeing the lens substrate with a dye. The lens substrate may or may not contain a dye. In other words, a dye-dyed lens substrate may be obtained by further dyeing a dye-containing lens substrate with a dye. Among these, a lens substrate containing a dye as a bluing agent is preferred.

[0017] Examples of lens substrates include lens substrates made of organic materials (plastics) and inorganic materials, with plastic lens substrates being preferred. Examples of lens substrates include finished lenses in which the convex and concave surfaces are optically finished and molded to the desired power, semi-finished lenses in which only the convex surface is finished as an optical surface (e.g., a spherical surface, a rotationally symmetric aspherical surface, and a progressive surface), and semi-finished lenses in which the concave surface is processed and polished to match the wearer's prescription. Examples of organic materials include acrylate resins, methacrylate resins, thiourethane resins, allyl resins, episulfide resins, polycarbonates, urethane resins, polyesters, polystyrene, polyethersulfone, poly4-methylpentene-1, and diethylene glycol bisallyl carbonate resins (CR-39). Thiourethane resins, episulfide resins, and diethylene glycol bisallyl carbonate resins are preferred.

[0018] The thiourethane resin is a resin obtained by polymerizing a polyisocyanate compound and a polythiol compound. Preferred polyisocyanate compounds include m-xylylene diisocyanate, a mixture of 2,5-bis(isocyanatomethyl)-bicyclo[2,2,1]heptane and 2,6-bis(isocyanatomethyl)-bicyclo[2,2,1]heptane, isophorone diisocyanate, hexamethylene diisocyanate, and tolylene diisocyanate. Preferred polythiol compounds include pentaerythritol tetrakis(3-mercaptopropionate), 1,2-bis[(2-mercaptoethyl)thio]-3-mercaptopropane, or a mixture of 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, and 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane. The episulfide resin is a resin obtained by ring-opening polymerization of a monomer having an episulfide group (epithio group) or a mixed monomer containing such a monomer. Preferred episulfide group-containing monomers are bis(2,3-epithiopropyl)sulfide or bis(2,3-epithiopropyl)disulfide.

[0019] When the lens substrate contains a dye, the lens substrate may be a lens substrate formed using a mixture of the material constituting the lens substrate and the dye, or may be a lens substrate having a layer containing the dye. Furthermore, as the lens substrate, a blue light cut lens substrate is preferred in terms of improving contrast sensitivity.

[0020] The luminous transmittance of the lens substrate is preferably 80.0 to 97.0%, more preferably 85.0 to 92.0%. The transmittance of the lens substrate at a wavelength of 400 nm is preferably 5.0% or less, more preferably 2.0% or less, and even more preferably 0.05% or less. The lower the transmittance at a wavelength of 400 nm, the more preferable (for example, 0% or more). The average transmittance of the lens substrate in the wavelength range of 415 to 440 nm is preferably 30.0 to 90.0%, more preferably 40.0 to 80.0%, even more preferably 45.0 to 70.0%, and particularly preferably 50.0 to 60.0%. The average transmittance of the lens substrate in the wavelength range of 450 to 500 nm is preferably 70.0 to 99.0%, more preferably 80.0 to 95.0%. The average transmittance of the lens substrate in the wavelength range of 530 to 570 nm is preferably 70.0 to 99.0%, more preferably 80.0 to 95.0%. The average transmittance of the lens substrate in the wavelength range of 600 to 650 nm is preferably 70.0 to 99.0%, more preferably 80.0 to 95.0%. The luminous transmittance, transmittance, and average transmittance can be measured by the same methods as those described above. Methods for adjusting the optical properties include, for example, adjusting the type and content of the dye, and the type of lens substrate.

[0021] From the viewpoint of ease of handling, the thickness of the lens substrate is preferably 0.8 to 30.0 mm, more preferably 1.0 to 10.0 mm. The thickness of the lens substrate is the center thickness of the lens substrate measured using a dial gauge. The refractive index of the lens substrate is preferably 1.50 or more, more preferably 1.60 to 1.80, and even more preferably 1.60 to 1.74.

[0022] (Dye) Examples of the dye include inorganic dyes, inorganic pigments, organic dyes, and organic pigments. In other words, the dye may be any of inorganic substances, organic substances, dyes thereof, pigments thereof, and mixtures thereof. Furthermore, when the lens substrate contains a dye, the dye for obtaining the dye-dyed lens substrate is preferably a dye other than the dye contained in the lens substrate. Examples of inorganic dyes and organic dyes include disperse dyes, reactive dyes, direct dyes, composite dyes, acid dyes, metal complex dyes, vat dyes, sulfide dyes, fluorescent dyes, phosphorescent dyes, and dyes for resin coloring.

[0023] Examples of inorganic dyes and inorganic pigments include fine particles of metals such as gold, silver, aluminum, and nickel; and fine particles of metal oxides such as titanium oxide, silicon oxide, and aluminum oxide.

[0024] As the organic dye, organic dyes having a heteroatom (e.g., nitrogen atom or oxygen atom) are preferred, and azo dyes, pyrazolone dyes, quinoline dyes, or cyanine dyes are more preferred. Commercially available organic dyes include FDG-002, FDG-004, and FDG-006 manufactured by Yamada Chemical Co., Ltd., ABS511, ABS527, and ABS556 manufactured by Exciton, and RDW R60 manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.

[0025] Examples of organic dyes include red dyes, blue dyes, brown dyes, violet dyes, orange dyes and black dyes, with red dyes being preferred in that they can adjust the optical properties of the dyed lens substrate and spectacle lens base.

[0026] Examples of red dyes include Kayalon polyester red (Kayalon Microester Red) AUL-S, Kayalon Microester Red 5L-E, Kayalon Microester Red C-LS conc, Kayalon Microester Red DX-LS, Kayalon polyester Red AN-SE, Kayalon Polyester Red B-LE, and Kayaron Polyester Rubine GL-SE 200 (manufactured by Nippon Kayaku Co., Ltd.); Kiwalon polyester Red ESP and Kiwalon polyester Red KN-SE (manufactured by Kiwa Chemical Industry Co., Ltd.); FSP-Red BL (manufactured by Futaba Sangyo Co., Ltd.); and Dianix Red (manufactured by Dystar Japan).

[0027] Examples of blue dyes include Kayalon Polyester Blue AUL-S dye (manufactured by Nippon Kayaku Co., Ltd.), Dianix Blue AC-E (manufactured by Dystar Japan Co., Ltd.); Kiwalon Polyester Blue ESP, Kiwalon Polyester Blue KN-SE (manufactured by Kiwa Chemical Co., Ltd.); Kayalon Microester Blue AQ-LE, Kayaron Microester Blue 5L-E, Kayalon Microester Blue C-LS conc, Kayalon Microester Blue DX-LS conc, Kayalon Polyester Blue AN-SE, and Kayaron Polyester Blue AUL-S(N) (manufactured by Nippon Kayaku Co., Ltd.); and FSP-Blue AUL-S (manufactured by Futaba Sangyo Co., Ltd.).

[0028] The dye content can be adjusted appropriately according to the desired optical properties of the dye-dyed lens substrate.

[0029] A method for dyeing a lens substrate with a dye to obtain a dye-dyed lens substrate will be described in detail below. Examples of methods for dyeing a lens substrate with a dye include a method of permeating the lens substrate with the dye. A preferred method for permeating the lens substrate with the dye is to permeate the dye using a dye solution containing the dye.

[0030] The dye solution preferably contains a dye, a surfactant, and a solvent. Examples of surfactants include ionic surfactants (e.g., anionic surfactants and cationic surfactants) and nonionic surfactants. Examples of solvents include water and organic solvents. Examples of organic solvents include alcohol-based solvents, ketone-based solvents, ether-based solvents, ester-based solvents, hydrocarbon-based solvents, halogenated hydrocarbon-based solvents, amide-based solvents, sulfone-based solvents, and sulfoxide-based solvents. The dye solution may contain additives such as a pH adjuster, a viscosity adjuster, a leveling agent, a matting agent, a stabilizer, a UV absorber, and an antioxidant.

[0031] The content of the dye is preferably 0.001 to 10% by mass, and more preferably 0.01 to 5% by mass, relative to the total mass of the dye solution. The content of the surfactant is preferably 0.001 to 10% by mass, and more preferably 0.005 to 5% by mass, relative to the total mass of the dye solution.

[0032] Examples of methods for permeating the dye into the lens substrate include the following, with the dipping method being preferred: Coating method: A method in which a dye solution is coated on the surface of the lens substrate and heated to allow the dye to be impregnated into the surface of the lens substrate; Dipping method: A method in which the lens substrate is immersed in a heated dye solution to allow the dye to be impregnated into the surface of the lens substrate; Sublimation dyeing method: A method in which a sublimable dye is coated on a transfer medium, and the lens substrate is placed near the transfer medium and heated to allow the dye to be impregnated into the surface of the lens substrate.

[0033] Coating methods in the coating method include brush coating, dipping, spin coating, roll coating, spray coating, flow coating, and inkjet coating. The surface to be coated may be one or both sides of the lens substrate.

[0034] The heating temperature in the coating method is preferably 70 to 180°C. The heating time in the coating method is preferably 10 to 180 minutes. Examples of heating methods include air oven heating, far-infrared radiation heating, and ultraviolet radiation heating. In the coating method, after coating the dye liquid, a gradient in dye concentration can be created by heating so that the heated area gradually changes.

[0035] The dyed lens substrate obtained by the coating method may be further washed, preferably by wiping with an organic solvent or by using an alkaline cleaner.

[0036] The dipping method preferably involves immersing the lens substrate in a dye solution heated to 80 to 95° C. The dye-dyed lens substrate obtained by the dipping method may be further washed. Examples of the washing method include wiping with a solvent.

[0037] The dyed lens substrate may contain additives such as light stabilizers, ultraviolet absorbers, and antioxidants.

[0038] The luminous transmittance of the dye-dyed lens substrate is preferably 75.0 to 90.0%, and more preferably 80.0 to 88.0%. The transmittance of the dye-dyed lens substrate at a wavelength of 400 nm is preferably 5.0% or less, more preferably 2.0% or less, and even more preferably 0.05% or less. The lower the transmittance at a wavelength of 400 nm, the more preferable (for example, 0% or more). The average transmittance of the dye-dyed lens substrate in the wavelength range of 415 to 440 nm is preferably 20.0 to 80.0%, more preferably 30.0 to 70.0%, and even more preferably 40.0 to 60.0%. The average transmittance of the dye-dyed lens substrate in the wavelength range of 450 to 500 nm is preferably 75.0 to 95.0%, and more preferably 80.0 to 90.0%. The average transmittance of the dye-dyed lens substrate in the wavelength range of 530 to 570 nm is preferably 70.0 to 90.0%, more preferably 80.0 to 90.0%. The average transmittance of the dye-dyed lens substrate in the wavelength range of 600 to 650 nm is preferably 75.0 to 95.0%, more preferably 80.0 to 90.0%. The luminous transmittance, transmittance, and average transmittance can be measured using methods similar to those described above. Methods for adjusting the optical properties include, for example, adjusting the type and content of the dye, and the type of lens substrate.

[0039] In the dye-dyed lens substrate, the average transmittance in the wavelength range of 530 to 570 nm is preferably lower than both the average transmittance in the wavelength range of 450 to 500 nm and the average transmittance in the wavelength range of 600 to 650 nm, and more preferably is lower by 2.0% or more (preferably 2.0 to 5.0%, more preferably 3.0 to 5.0%) than both the average transmittance in the wavelength range of 450 to 500 nm and the average transmittance in the wavelength range of 600 to 650 nm.

[0040] From the viewpoint of ease of handling, the thickness of the dye-dyed lens substrate is preferably 0.8 to 30.0 mm, more preferably 1.0 to 10.0 mm. The thickness of the dye-dyed lens substrate is the center thickness of the dye-dyed lens substrate measured using a dial gauge. The refractive index of the dye-dyed lens substrate is preferably 1.50 or more, more preferably 1.60 to 1.80, and even more preferably 1.60 to 1.74.

[0041] <Functional Layer> The spectacle lens may have a functional layer. Examples of functional layers include a primer layer, a hard coat layer, an anti-reflection layer, a water- and oil-repellent layer, and a dye layer. The functional layer may also contain a dye obtained by dyeing the lens substrate using the dye described above. Examples of the dye include the dye contained in a dye-dyed lens substrate. When the spectacle lens has a functional layer, the spectacle lens preferably has a dye-dyed lens substrate, a primer layer, a hard coat layer, and an anti-reflection layer in this order. The functional layer may be present on at least one surface of the dye-dyed lens substrate, or on both surfaces.

[0042] (Primer Layer) The spectacle lens may have a primer layer. The primer layer improves the adhesion between the dyed lens substrate and the hard coat layer, and can improve the impact resistance of the spectacle lens.

[0043] The primer layer preferably contains a resin. The resin may be particulate. Examples of the resin include urethane resin, epoxy resin, phenol resin, polyimide, polyester, bismaleimide resin, and polyolefin, and urethane resin is preferred. The primer layer may contain additives such as the above-mentioned dye and surfactant.

[0044] Examples of methods for forming a primer layer include a method in which a primer layer-forming composition containing a resin is applied to a dye-dyed lens substrate, and if necessary, a curing treatment is performed to form a primer layer. Methods for applying the primer layer-forming composition include, for example, dipping coating, spin coating, spray coating, inkjet coating, and flow coating. For example, when using the dipping coating method, a dye-dyed lens substrate is immersed in the primer layer-forming composition, and the dye-dyed lens substrate is pulled out and then dried, thereby forming a coating film derived from the primer layer-forming composition on the dye-dyed lens substrate.

[0045] The thickness of the primer layer is preferably 0.3 to 2.0 μm.

[0046] (Hard Coat Layer) The eyeglass lens may have a hard coat layer. When the eyeglass lens has a hard coat layer, the scratch resistance of the eyeglass lens can be improved. The hard coat layer preferably exhibits a pencil hardness of H or higher in accordance with JIS K5600.

[0047] As the hard coat film, for example, known hard coat film can be mentioned.Specifically, urethane-based impact resistance improving coat film and silicone-based scratch resistance improving hard coat film can be mentioned.As the hard coat film, for example, a layer made of silicon-based hard coat composition can be mentioned, and a layer made of silicon-based hard coat composition containing (A) metal oxide particles, (B) organosilicon compound or its hydrolyzate, and (C) curing catalyst is preferred.

[0048] (A) Examples of metal oxide particles include fine particles of metal oxides such as iron oxide, zinc oxide, aluminum oxide, titanium oxide, zirconium oxide, tin oxide, beryllium oxide, antimony oxide, tungsten oxide, and cerium oxide. The metal oxide particles may be used singly or in combination of two or more types. Composite metal oxide fine particles composed of two or more metal oxides selected from these metal oxides may also be used. The average particle size of these metal oxide fine particles or composite metal oxide fine particles is preferably 1 to 100 nm. Metal oxide particles that form a sol when dispersed in water, methanol, or other organic solvents are preferred.

[0049] As the organosilicon compound (B) or its hydrolyzate, a compound represented by formula (B) is preferred.

[0050] R １ ａ R ２ ｂ Si(OR ３ ) ４－（ａ＋ｂ） (B)

[0051] In formula (B), R １ represents an organic group having a functional group or an organic group having an unsaturated double bond and having 4 to 14 carbon atoms. ２ represents a hydrocarbon group or a halogenated hydrocarbon group having 1 to 6 carbon atoms. ３ represents an alkyl group, an alkoxyalkyl group, or an acyl group having 1 to 4 carbon atoms. a and b each independently represent 0 or 1. a+b is 1 or 2.

[0052] Examples of the compound represented by formula (B) include γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-glycidoxypropyltriacetoxysilane, γ-glycidoxypropylmethyldimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, and β-(3,4-epoxycyclohexyl)ethyltriethoxysilane. １Examples of the compound represented by formula (B) other than those having an epoxy group as a functional group (including the case where a represents 0) include trialkoxysilanes, triacyloxysilanes, and trialkoxyalkoxysilanes such as methyltrimethoxysilane, methyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltriacetoxysilane, vinyltrimethoxyethoxysilane, γ-methacryloxypropyltrimethoxysilane, aminomethyltrimethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, γ-chloropropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, and 3,3,3-trifluoropropyltrimethoxysilane.

[0053] Examples of the curing catalyst (C) include metal alkoxides, organic metal salts, tin compounds, amines (see JP 2004-315556 A), phosphines, quaternary ammonium salts, quaternary phosphonium salts, tertiary sulfonium salts, secondary iodonium salts, mineral acids, Lewis acids, organic acids or anhydrides thereof, silicic acids, tetrafluoroboric acids, peroxides, azo compounds, condensates of aldehydes and ammonia compounds, guanidines, thiouric acids, thiazoles, sulfenamides, thiurams, dithiocarbamates, xanthogenates, and acidic phosphate esters, with quaternary ammonium salts being preferred, and triethylbenzylammonium chloride being more preferred.

[0054] Examples of the (C) curing catalyst include amines and metal complex compounds. Examples of amines include monoethanolamine, diethanolamine, isopropanolamine, ethylenediamine, isopropylamine, diisopropylamine, morpholine, triethanolamine, diaminopropane, aminoethylethanolamine, dicyandiamide, triethylenediamine, and 2-ethyl-4-methylimidazole. Examples of the metal complex compounds include acetylacetonate metal complex compounds containing a central metal selected from Li, Zn, Mn, Mg, Fe, Cu, Co, Ca, Bi, Al, Ni, Cr, Zr, and V, and ethylenediaminetetraacetic acid chelate metal complex compounds. Specific examples include aluminum acetylacetonate, aluminum bisethylacetoacetate, monoacetylacetonate, aluminum-di-n-butoxide-monoethylacetoacetate, aluminum-di-iso-propoxide-monomethylacetoacetate, chromium acetylacetonate, titanyl acetylacetonate, cobalt acetylacetonate, iron(III) acetylacetonate, manganese acetylacetonate, nickel acetylacetonate, indium acetylacetonate, iron ethylenediaminetetraacetate, aluminum ethylenediaminetetraacetate, zinc ethylenediaminetetraacetate, manganese ethylenediaminetetraacetate, magnesium ethylenediaminetetraacetate, copper ethylenediaminetetraacetate, cobalt ethylenediaminetetraacetate, calcium ethylenediaminetetraacetate, and bismuth ethylenediaminetetraacetate.

[0055] Examples of metal alkoxides include aluminum triethoxide, aluminum tri-n-propoxide, aluminum tri-n-butoxide, tetraethoxytitanium, tetra-n-butoxytitanium, and tetra-i-propoxytitanium. Examples of organic metal salts include sodium acetate, zinc naphthenate, cobalt naphthenate, and tin octoate. Examples of perchlorates include magnesium perchlorate and ammonium perchlorate. Examples of organic acids or anhydrides thereof include malonic acid, succinic acid, tartaric acid, adipic acid, azelaic acid, maleic acid, O-phthalic acid, terephthalic acid, fumaric acid, itaconic acid, oxaloacetic acid, maleic anhydride, succinic anhydride, itaconic anhydride, 1,2-dimethylmaleic anhydride, phthalic anhydride, hexahydrophthalic anhydride, and naphthalic anhydride. Examples of Lewis acids include ferric chloride and aluminum chloride. Metal halides include, for example, stannous chloride, stannic chloride, tin bromide, zinc chloride, zinc bromide, titanium bromide, titanium tetrachloride, thallium bromide, germanium chloride, hafnium chloride, lead chloride, and lead bromide.

[0056] The curing catalyst may be used alone or in combination of two or more. In addition to the above-mentioned curing catalysts, when a silane compound having an epoxy group is used as the curing catalyst, a compound that also performs ring-opening polymerization of the epoxy group can be used. Specific examples thereof include aluminum chelate compounds.

[0057] For example, when forming a hard coat layer, a hard coat layer-forming composition containing all of the above components (A) to (C) is applied to the surface of a dye-dyed lens substrate using a dipping method, a spraying method, a spin coating method, or the like to form a coating film. The coating film is then cured by heat curing or photocuring to form a hard coat layer. The heating temperature for the coating film is preferably 70 to 140°C, more preferably 90 to 120°C. The thickness of the coating film is preferably 1.0 to 10.0 μm, more preferably 1.5 to 4.0 μm. The hard coat layer-forming composition may also contain a solvent and / or additives. Examples of solvents include water, lower alcohols, acetone, ethers, ketones, and esters. Examples of additives include pH adjusters, viscosity adjusters, leveling agents, matting agents, dyes, pigments, stabilizers, UV absorbers, and antioxidants.

[0058] (Anti-Reflection Layer) The spectacle lens may have an anti-reflection layer. When the spectacle lens has an anti-reflection layer, it is preferable that the spectacle lens has a hard coat layer and that the anti-reflection layer is adjacent to the hard coat layer. The anti-reflection layer may have a single-layer structure or a multi-layer structure. The anti-reflection layer is preferably an inorganic anti-reflection layer. The inorganic anti-reflection layer refers to an anti-reflection layer composed of an inorganic compound. The multi-layer anti-reflection layer may have a structure in which low-refractive-index layers and high-refractive-index layers are alternately stacked. Examples of materials constituting the high-refractive-index layer include titanium, zirconium, aluminum, niobium, tantalum, and lanthanum oxide. Examples of materials constituting the low-refractive-index layer include silicon oxide. Methods for forming the anti-reflection layer include dry methods such as vacuum deposition, sputtering, ion plating, ion-beam assisted deposition, and CVD.

[0059] (Water- and oil-repellent layer) The eyeglass lens may have a water- and oil-repellent layer. When the eyeglass lens has a water- and oil-repellent layer, it is preferable that the eyeglass lens has a water- and oil-repellent layer as the outermost layer of the eyeglass lens. The water- and oil-repellent layer reduces the surface energy of the eyeglass lens, thereby improving the stain resistance and slipperiness of the eyeglass lens and also improving the abrasion resistance of the eyeglass lens.

[0060] Examples of components that the water- and oil-repellent layer may contain include fluorine-containing compounds (compounds having fluorine atoms). In terms of superior water- and oil-repellency, organosilicon compounds having an alkyl group in which some or all of the hydrogen atoms are substituted with fluorine atoms and having a hydrolyzable group, as well as their hydrolyzates and hydrolyzed condensates, are preferred. The hydrolyzable group is a group directly bonded to a silicon atom and capable of undergoing hydrolysis and condensation reactions, such as an alkoxy group, a halogen atom, an acyloxy group, an alkenyloxy group, and an isocyanate group. The hydrolyzate refers to a compound obtained by hydrolyzing the hydrolyzable group in the organosilicon compound. The hydrolyzate may be a compound in which all of the hydrolyzable groups are hydrolyzed (complete hydrolyzate) or a compound in which only a portion of the hydrolyzable groups are hydrolyzed (partial hydrolyzate). In other words, the hydrolyzate may be a complete hydrolyzate, a partial hydrolyzate, or a mixture thereof. The hydrolyzed condensate of the organosilicon compound refers to a compound obtained by hydrolyzing the hydrolyzable group in the organosilicon compound and condensing the resulting hydrolyzate. The hydrolysis condensate may be one in which all hydrolyzable groups are hydrolyzed and all of the hydrolyzates are condensed (complete hydrolysis condensate), or one in which some of the hydrolyzable groups are hydrolyzed and some of the hydrolyzates are condensed (partial hydrolysis condensate). In other words, the hydrolysis condensate may be any of a complete hydrolysis condensate, a partial hydrolysis condensate, and a mixture thereof.

[0061] Examples of methods for forming the water- and oil-repellent layer include a method in which a composition for forming a water- and oil-repellent layer is applied to a dye-dyed lens substrate to form a coating film, and the coating film is then subjected to a curing treatment such as light irradiation treatment. After the coating film is formed, a drying treatment such as heating treatment may be performed to remove the solvent from the coating film.

[0062] The thickness of the water- and oil-repellent layer is preferably 5.0 to 35.0 nm.

[0063] (Dye Layer) The dye layer is not particularly limited as long as it is a layer formed by a coating method or the like using the dye liquid described above.

[0064] (Other Layers) The spectacle lens may have other layers in addition to the layers that the spectacle lens may contain. Examples of other layers include a protective layer.

[0065] [Second Embodiment] A spectacle lens of a second embodiment is a spectacle lens having a lens substrate and a functional layer containing a dye, wherein the difference (absolute value) between the luminous transmittance of the spectacle lens and the luminous transmittance of a reference lens obtained by removing the dye from the spectacle lens is 1.0 to 4.0%, the difference (absolute value) between the average transmittance of the spectacle lens in a wavelength range of 530 to 570 nm and the average transmittance of the reference lens in a wavelength range of 530 to 570 nm is 1.0 to 5.0%, the transmittance of the spectacle lens at a wavelength of 400 nm is 2.0% or less, and the average transmittance of the spectacle lens in a wavelength range of 415 to 440 nm is 40.0 to 80.0%.

[0066] The spectacle lens of the second embodiment is the same as the spectacle lens of the first embodiment, except that it does not have a dye-dyed lens substrate and has a functional layer containing a dye, and other than the points described below, the preferred embodiments are also the same. For example, the preferred ranges of the luminous transmittance of the spectacle lens of the second embodiment, the average transmittance of the spectacle lens in a wavelength range of 450 to 500 nm, the average transmittance of the spectacle lens in a wavelength range of 530 to 570 nm, and the average transmittance of the spectacle lens in a wavelength range of 600 to 650 nm are the same as the preferred ranges of each parameter of the spectacle lens of the first embodiment described above.

[0067] In the spectacle lens, the difference (absolute value) between the luminous transmittance of the spectacle lens and the luminous transmittance of the reference lens is 1.0 to 4.0%, preferably 1.5 to 3.0%, and more preferably 1.5 to 2.5%. The luminous transmittance of the reference lens is preferably greater than that of the spectacle lens. The difference (absolute value) between the average transmittance of the spectacle lens in a wavelength range of 530 to 570 nm and the average transmittance of the reference lens in a wavelength range of 530 to 570 nm is 1.0 to 5.0%, preferably 2.0 to 4.0%, and more preferably 2.5 to 3.5%. The average transmittance of the reference lens in a wavelength range of 530 to 570 nm is preferably greater than the average transmittance of the spectacle lens in a wavelength range of 530 to 570 nm. The transmittance of the spectacle lens at a wavelength of 400 nm is 2.0% or less, preferably 1.0% or less, and more preferably 0.05% or less. The lower the transmittance at a wavelength of 400 nm, the more preferable (for example, 0% or higher). The average transmittance of the spectacle lens in the wavelength range of 415 to 440 nm is 40.0 to 80.0%, preferably 50.0 to 75.0%, and more preferably 55.0 to 73.0%.

[0068] The reference lens is a lens obtained by removing the pigment from a spectacle lens. The reference lens is identical to the spectacle lens to be measured, except that it does not contain any pigment. Specifically, a reference lens for a spectacle lens having a lens substrate and a functional layer containing a pigment is a lens having the lens substrate of the spectacle lens and the same functional layer as the spectacle lens, except that the functional layer does not contain any pigment (a functional layer having the same components and the same thickness except for the pigment). The reference lens may be obtained by using a lens substrate and a functional layer that does not contain any pigment when manufacturing a spectacle lens.

[0069] An example of a functional layer containing a dye is a functional layer that can be included in the spectacle lens of the first embodiment, in which the functional layer contains a dye.

[0070] [Third embodiment] In a spectacle lens of a third embodiment, the spectacle lens has a transmittance of 2.0% or less at a wavelength of 400 nm, an average transmittance of 40.0 to 80.0% in a wavelength range of 415 to 440 nm, and an average transmittance of 530 to 570 nm in a wavelength range that is lower than both the average transmittance in a wavelength range of 450 to 500 nm and the average transmittance in a wavelength range of 600 to 650 nm.

[0071] The spectacle lens of the third embodiment preferably has the same configuration as the spectacle lens of the first embodiment, except for having specific optical properties, and the preferred embodiments are also the same. For example, the preferred ranges of the luminous transmittance of the spectacle lens of the third embodiment, the average transmittance of the spectacle lens in a wavelength range of 450 to 500 nm, the average transmittance of the spectacle lens in a wavelength range of 530 to 570 nm, and the average transmittance of the spectacle lens in a wavelength range of 600 to 650 nm are the same as the preferred ranges of each parameter of the spectacle lens of the first embodiment described above.

[0072] The spectacle lens has a transmittance of 2.0% or less at a wavelength of 400 nm, preferably 1.0% or less, and more preferably 0.05% or less. The lower the transmittance at a wavelength of 400 nm, the more preferable it is (for example, 0% or more). The spectacle lens has an average transmittance in the wavelength range of 415 to 440 nm of 40.0 to 80.0%, preferably 50.0 to 75.0%, and more preferably 55.0 to 73.0%.

[0073] Furthermore, in the spectacle lens, it is preferable that the average transmittance in the wavelength range of 530 to 570 nm is lower than both the average transmittance in the wavelength range of 450 to 500 nm and the average transmittance in the wavelength range of 600 to 650 nm, and it is even more preferable that it is lower by 2.0% or more (preferably 2.0 to 5.0%, more preferably 3.0 to 5.0%) than both the average transmittance in the wavelength range of 450 to 500 nm and the average transmittance in the wavelength range of 600 to 650 nm.

[0074] The present disclosure will be explained in more detail below using examples, but the present disclosure is not limited to these examples in any way.

[0075] Example 1 Pure water (1000 parts by mass) was placed in a container, and FSP-Red BL dye (2.0 parts by mass, manufactured by Futaba Sangyo Co., Ltd.) as a red dye and Nikka Sunsalt #7000 (1.0 part by mass, manufactured by Nicca Chemical Co., Ltd.) as a surfactant were added to obtain a dye solution.

[0076] Next, a plastic lens substrate (Nikon Essilor, Nikon Lite 3ASPBUV, size 75φ, center thickness 2 mm) made of a thiourethane resin with a refractive index of 1.60 was immersed for a short time in the above dyeing solution heated to 90°C to produce a dye-dyed lens substrate (light red). A 1 μm-thick urethane primer layer was formed on both surfaces of the obtained dye-dyed lens substrate, a 2 μm-thick silicone hard coat layer was formed on the primer layer, and a 0.3 μm-thick multilayer antireflection layer composed of inorganic oxides was formed on the hard coat layer by vacuum deposition, thereby obtaining the spectacle lens of Example 1. The above plastic lens substrate is a lens substrate containing a dye as a bluing agent, and is a so-called blue light-cut lens substrate.

[0077] Comparative Example 1 A spectacle lens of Comparative Example 1 was obtained in the same manner as in Example 1, except that the lens substrate was not dyed with a dye solution.

[0078] [Comparative Example 2] A spectacle lens of Comparative Example 2 was obtained in the same manner as in Example 1, except that the dyeing time (immersion time) of the lens substrate using the dye solution was extended so as to achieve the difference in luminous transmittance shown in the table below.

[0079] [Luminous transmittance, transmittance, average transmittance] Using a spectrophotometer (Spectrophotometer U-4100, manufactured by Hitachi High-Technologies Corporation), the lens substrate, dyed lens substrate, and spectacle lens were each measured by the method described above. Figure 1 shows the transmission spectrum of each spectacle lens in the wavelength range of 380 to 780 nm.

[0080] [Contrast Sensitivity] A display showing an index with the letter "E" with different contrast ratios was placed 1 m away from the subject, and the minimum contrast ratio at which seven subjects wearing each eyeglass lens could distinguish the index with both eyes was recorded, and the median was calculated. The contrast ratio value is the absolute value of Weber contrast. The smaller the contrast ratio, the better the subject's contrast sensitivity. The contrast sensitivity evaluation was carried out in two environments: a bright place and a dark place. The bright place was under LED (light-emitting diode) lighting, with an illuminance of 500 lux near the subject's eyes, a color temperature of 5000 K, and a display brightness of 250 cd / m ２ The dark environment is defined as an environment where the illuminance near the subject's eyes is 15 lux under LED lighting, the color temperature is 2500 K, and the display brightness is 28 cd / m ２ This refers to an environment in which:

[0081] In the table, the column "(A)" indicates the difference (absolute value) between the luminous transmittance of the lens substrate and the luminous transmittance of the dye-dyed lens substrate, and the column "(B)" indicates the difference (absolute value) between the average transmittance of the lens substrate in the wavelength range of 530 to 570 nm and the average transmittance of the dye-dyed lens substrate in the wavelength range of 530 to 570 nm.

[0082]

[0083] The evaluation results in the table confirm that the spectacle lenses of the present disclosure can improve contrast sensitivity in both bright and dark environments.

Claims

1. A spectacle lens having a dye-dyed lens substrate obtained by dyeing a lens substrate with a dye, the difference between the luminous transmittance of the lens substrate and the luminous transmittance of the dyed lens substrate is 1.0 to 4.0%, the difference between the average transmittance of the lens substrate in a wavelength range of 530 to 570 nm and the average transmittance of the dye-dyed lens substrate in a wavelength range of 530 to 570 nm is 1.0 to 5.0%, The spectacle lens has a transmittance of 2.0% or less at a wavelength of 400 nm, The spectacle lens has an average transmittance of 40.0 to 80.0% in a wavelength range of 415 to 440 nm.

2. A spectacle lens having a lens substrate and a functional layer containing a dye, the difference between the luminous transmittance of the spectacle lens and the luminous transmittance of a reference lens obtained by removing the pigment from the spectacle lens is 1.0 to 4.0%, the difference between the average transmittance of the spectacle lens in a wavelength range of 530 to 570 nm and the average transmittance of the reference lens in a wavelength range of 530 to 570 nm is 1.0 to 5.0%, The spectacle lens has a transmittance of 2.0% or less at a wavelength of 400 nm, The spectacle lens has an average transmittance of 40.0 to 80.0% in a wavelength range of 415 to 440 nm.

3. A spectacle lens, The spectacle lens has a transmittance of 2.0% or less at a wavelength of 400 nm, The spectacle lens has an average transmittance of 40.0 to 80.0% in a wavelength range of 415 to 440 nm, The spectacle lens has an average transmittance in a wavelength range of 530 to 570 nm that is lower than both the average transmittance in a wavelength range of 450 to 500 nm and the average transmittance in a wavelength range of 600 to 650 nm.

4. The eyeglass lens according to any one of claims 1 to 3, wherein the average transmittance in a wavelength range of 530 to 570 nm is lower by 2.0% or more than both the average transmittance in a wavelength range of 450 to 500 nm and the average transmittance in a wavelength range of 600 to 650 nm.

5. The spectacle lens according to any one of claims 1 to 3, wherein the spectacle lens has an average transmittance of 90.0% or more in a wavelength range of 450 to 500 nm, an average transmittance of 85.0 to 93.0% in a wavelength range of 530 to 570 nm, and an average transmittance of 90.0% or more in a wavelength range of 600 to 650 nm.

6. The eyeglass lens according to any one of claims 1 to 3, wherein the spectacle lens has a luminous transmittance of 89.0 to 94.0%.