Spectacle lens design method and spectacle lens manufacturing method

Abstract

The present disclosure addresses the problem of providing a spectacle lens manufacturing method that makes it possible to make the thicknesses of left-eye and right-eye spectacle lenses the same. A spectacle lens design method according to the present disclosure comprises: a step for calculating, on the basis of lens design information including power information, the thicknesses of a right-eye spectacle lens and a left-eye spectacle lens when the right-eye spectacle lens and the left-eye spectacle lens are formed using a first material; a step for determining whether or not the difference between the thickness of the right-eye spectacle lens and the thickness of the left-eye spectacle lens exceeds a prescribed value; a step for, if the difference exceeds the prescribed value and when the thicker of the right-eye spectacle lens and the left-eye spectacle lens is defined as a reference lens, calculating a first refractive index of a lens other than the reference lens, the other lens having a thickness difference of a prescribed value or less from the thickness of the reference lens while satisfying the lens design information; and a step for, in a mixture including the first material and a second material having a refractive index lower than that of the first material, obtaining a mixing ratio at which the refractive index of the mixture becomes the first refractive index using a previously created relationship between mixing ratios between the first material and the second material and the refractive indices of the mixture.

Description

Eyeglass lens design method and eyeglass lens manufacturing method

[0001] The present disclosure relates to a method for designing an eyeglass lens and a method for manufacturing an eyeglass lens.

[0002] Various studies have been conducted on spectacle lenses. For example, Patent Document 1 discloses a method for manufacturing a precursor lens for a spherical lens, which does not significantly change the thickness of the edge. Specifically, the method discloses a method for manufacturing a precursor spectacle lens, which removes the periphery of the lens to fit a specific spectacle frame.

[0003] JP 2011-022292 A

[0004] The present disclosure relates to a method for designing eyeglass lenses, the method comprising the steps of: calculating thicknesses of a right-eye eyeglass lens and a left-eye eyeglass lens when the right-eye eyeglass lens and the left-eye eyeglass lens are formed using a first material based on lens design information including power information; determining whether a difference between the thickness of the right-eye eyeglass lens and the thickness of the left-eye eyeglass lens exceeds a predetermined value; and, if the difference exceeds the predetermined value, calculating a first refractive index of a lens other than a reference lens, the first refractive index of which is equal to or smaller than a predetermined value when the thicker of the right-eye eyeglass lens and the left-eye eyeglass lens is used as a reference lens, while satisfying the lens design information; and determining a mixing ratio of the first material and the second material, which is a mixture containing the first material and a second material having a refractive index lower than that of the first material, using a relationship between a mixing ratio of the first material and the second material prepared in advance and the refractive index of the mixture, such that the refractive index of the mixture is the first refractive index. The present disclosure also relates to a method for manufacturing eyeglass lenses.

[0005] Fig. 1 is a schematic diagram showing an example of a design device capable of implementing a method for designing a spectacle lens according to an embodiment of the present disclosure; Fig. 2 is a flowchart showing an example of a method for designing a spectacle lens according to an embodiment of the present disclosure in order of steps; and Fig. 3 is a flowchart showing a modified example of a method for designing a spectacle lens according to an embodiment of the present disclosure in order of steps.

[0006] The method for designing eyeglass lenses according to the present disclosure will be described in detail below. In the method for designing eyeglass lenses, it is required that the thicknesses of the left-eye and right-eye eyeglass lenses are similar from the viewpoint of weight balance, etc. The method for designing eyeglass lenses according to the present disclosure allows the thicknesses of the left-eye and right-eye eyeglass lenses to be similar. Furthermore, according to the method for manufacturing eyeglass lenses according to the present disclosure, eyeglass lenses having the same thicknesses for the left-eye and right-eye eyeglass lenses can be manufactured. Note that in this disclosure, the term "to" is used to mean that the numerical values ​​before and after it are included as the lower and upper limits. Furthermore, in this disclosure, refractive index refers to the refractive index at the e-line unless otherwise specified.

[0007] <Spectacle Lens Design Method> The spectacle lens design method of the present disclosure will be described below, divided into a lens thickness calculation step, a determination step, a refractive index calculation step, and a mixing ratio calculation step. In the lens thickness calculation step, the thicknesses of the right-eye spectacle lens and the left-eye spectacle lens when formed using a first material are calculated based on lens design information including power information. In the determination step, it is determined whether the difference in thickness between the right-eye spectacle lens and the left-eye spectacle lens exceeds a predetermined value. In the refractive index calculation step, if the difference in thickness between the right-eye spectacle lens and the left-eye spectacle lens exceeds the predetermined value in the determination step, a first refractive index of a lens other than the reference lens is calculated, such that when the thicker of the right-eye spectacle lens or the left-eye spectacle lens is used as the reference lens, the difference in thickness from the reference lens is equal to or less than a predetermined value while satisfying the lens design information. In the mixing ratio calculation process, in a mixture containing the first material and a second material having a refractive index lower than that of the first material, the mixing ratio of the first material and the second material prepared in advance is used to determine the mixing ratio of the first material and the second material such that the refractive index of the mixture becomes the first refractive index, using the relationship between the refractive index of the mixture and the mixing ratio of the first material and the second material prepared in advance.

[0008] An example of an embodiment of the method for designing a spectacle lens according to the present disclosure will be described below. Note that, hereinafter, this example of an embodiment of the method for designing a spectacle lens according to the present disclosure will also be simply referred to as "the present design method."

[0009] First, a design device capable of implementing this design method will be described. Fig. 1 shows the configuration of a design device 10 capable of implementing this design method. The design device 10 has a processing unit 12, a display unit 14, and an input unit 16. The processing unit 12 has a memory unit 20, a control unit 22, a lens design unit 24, a thickness calculation unit 26, a selection unit 28, and a mixture ratio calculation unit 30. The processing unit 12 is controlled via the control unit 22, and the lens design unit 24, the thickness calculation unit 26, the selection unit 28, and the mixture ratio calculation unit 30 perform various calculations, etc.

[0010] The input unit 16 is an input device such as a mouse and keyboard for inputting various information in response to instructions from an operator. The display unit 14 is configured, for example, as a monitor, and displays information such as the lens design information, the thickness of the right-eye spectacle lens, the thickness of the left-eye spectacle lens, the first refractive index, and the mixing ratio of the first material and the second material. The display unit 14 and the input unit 16 may be integrated into a touch panel.

[0011] The control unit 22 executes a program stored in the storage unit 20 to control the processing unit 12 via the control unit 22 and perform various calculations. The storage unit 20 may also store the lens design information, the refractive index of the first material, the thickness of the right-eye spectacle lens, the thickness of the left-eye spectacle lens, the first refractive index, and the relationship between the mixture ratio of the first material and the second material and the refractive index of the mixture. The configuration of the storage unit 20 is not particularly limited as long as it can store information. The storage unit 20 may be a physical storage medium such as a hard disk drive (HDD), a solid state drive (SSD), or a dynamic random access memory (DRAM), or may be a storage area on a cloud connected via the Internet. The control unit 22 may be, for example, a computer that functions by executing a program, or a dedicated device configured with dedicated circuits. The control unit 22 may be configured separately from the processing unit 12.

[0012] The lens design unit 24 generates the shape of a right-eye spectacle lens and the shape of a left-eye spectacle lens based on at least one of the lens design information stored in the storage unit 20 and the lens design information input from the input unit 16. There are no particular restrictions on the data format of the generated lens shapes, and any known format can be used.

[0013] As described above, the lens design information includes power information. Examples of the power information include one or more pieces of information selected from the group consisting of spherical power, distance power, near power, addition power, astigmatism power, astigmatism axis, and prism power. It is particularly preferable that the power information include at least one piece of information on distance power and near power. The lens design information may also include other information. Examples of other information included in the lens design information include one or more pieces of information selected from the group consisting of inset coordinates, lens shape (e.g., elliptical, track-shaped, etc.), product type (far / near, intermediate / near, near), fitting parameters (curvature angle, total plan, corneal vertex distance), and lens mounting method for the eyeglass frame (e.g., full-circumference support, upper end support, lower end support, two-point, etc.). The lens design information may be created based on prescription information prescribed by a doctor or measurement information obtained at an eyeglass store or the like.

[0014] The thickness calculation unit 26 measures the maximum thickness of each of the right-eye spectacle lens shapes and the left-eye spectacle lens shapes generated by the lens design unit 24. The thickness calculation unit 26 also calculates the difference between the maximum thicknesses of the right-eye spectacle lens shapes and the left-eye spectacle lens shapes.

[0015] The selection unit 28 selects a reference lens based on the maximum thickness of the shapes of the right-eye spectacle lens and the left-eye spectacle lens measured by the thickness calculation unit 26. The reference lens is the lens with the greater maximum thickness out of the right-eye spectacle lens and the left-eye spectacle lens.

[0016] In a mixture containing the first material and a second material having a refractive index lower than that of the first material, the mixing ratio calculation unit 30 uses the relationship between the mixing ratio of the first material and the second material prepared in advance and the refractive index of the mixture to determine the mixing ratio of the first material and the second material such that the refractive index of the mixture becomes the first refractive index.

[0017] Next, a procedure for carrying out this design method will be described. The procedure for carrying out this design method will be described using the flowchart shown in Fig. 2. When this design method is carried out using a design device 10, an eyeglass lens is designed. Fig. 2 is a flowchart showing an example of a method for designing an eyeglass lens according to an embodiment of the present disclosure in the order of steps.

[0018] In step S11, lens design information is acquired using the design device 10. There are no particular limitations on the method for acquiring the lens design information, and the methods described above can be applied as appropriate. For example, the lens design information is input via the input unit 16, and the design device 10 acquires the lens design information. The lens design information may be stored in the storage unit 20, or may be displayed on the display unit 14. Once step S11 is complete, the process proceeds to step S12.

[0019] In step S12, the thickness t Ｒ More specifically, in step S12, the lens design information acquired in step S11 and the refractive index n １ The shape of the right-eye spectacle lens is generated using the lens design unit 24 of the design device 10 with reference to the above. The method for generating the lens shape is not particularly limited, and any known method can be used. Next, the maximum thickness of the lens shape is measured using the thickness calculation unit 26 from the generated shape of the right-eye spectacle lens. For example, if the spectacle lens is a spectacle lens for correcting myopia, the maximum thickness is often at the outer edge of the lens shape. The maximum thickness of the lens shape may be calculated using a predetermined formula. An example of the predetermined formula is formula (A) shown below, but is not particularly limited. The measured maximum thickness is multiplied by the thickness t Ｒ The thickness tＲ may be stored in the storage unit 20 or may be displayed on the display unit 14. When step S12 is completed, the process proceeds to step S13.

[0020] In step S13, the thickness t Ｌ Step S13 can be performed in the same manner as step S12. Ｌ may be stored in the storage unit 20 or may be displayed on the display unit 14. When step S13 is completed, the process proceeds to step S14. Note that when steps S11 to S13 are performed, the lens thickness calculation process described above is performed.

[0021] In step S14, t Ｒ -t Ｌ Calculate the value of Δt, which is the absolute value of t Ｔ The calculation of Δt is performed by the thickness calculation unit 26. Ｔ The determination of whether or not the thickness exceeds the predetermined value is also performed by the thickness calculation unit 26. Ｔ is a predetermined value in the above-mentioned determination step, and is a value that can be set appropriately. Ｔ The value of t can be set to, for example, 2.0 mm, 1.0 mm, 0.5 mm, 0.2 mm, 0.15 mm, 0.1 mm, etc. Ｔ The value of t is input via the input unit 16, for example. Ｔ If it is greater than t, the process proceeds to step S15. Ｔ If it is equal to or less than this, steps S15 to S18 described below are skipped, and the right-eye spectacle lens and the left-eye spectacle lens are designed using only the first material. The value of Δt may be stored in the storage unit 20 or may be displayed on the display unit 14. When step S14 is performed, the above-mentioned determination step is performed.

[0022] In step S15, the thickness t obtained in step S13 is Ｒ and thickness t ＬThe lens with the larger value (the thicker of the right-eye spectacle lens and the left-eye spectacle lens) is set as the reference lens. The setting of the reference lens is performed by the selection unit 28, and the selection unit 28 uses the calculated thickness t Ｒ and thickness t Ｌ and select a reference lens. Information on the selected reference lens may be stored in the storage unit 20 or displayed on the display unit 14. After step S15 is completed, the process proceeds to step S16.

[0023] In step S16, while satisfying the above lens design information, Δt is set to t Ｔ The first refractive index of the lenses other than the reference lens is calculated as follows. In step S16, for example, a method for calculating the first refractive index includes setting the maximum thickness so that Δt is 0.0 mm and regenerating the lens shapes of the lenses other than the reference lens with the refractive index as a variable. The lens shapes of the lenses other than the reference lens are calculated using the acquired lens design information in the lens design unit 24, while adjusting the maximum thickness so that Δt is the above value. Reducing the refractive index of the lens makes the lens thicker, and the maximum thickness also increases. Therefore, the first refractive index is greater than the refractive index of the first material. Note that if a formula for calculating the maximum thickness of the lens shape is known, that formula may be used to calculate the first refractive index. The formula for calculating the maximum thickness of the lens shape usually includes the refractive index.

[0024] In step S16, another method for determining the first refractive index is to repeatedly generate lens shapes of lenses other than the reference lens in the lens design unit 24 while changing the refractive index, measure the maximum thickness of the lens, calculate Δt, and calculate the value t Ｔ For example, it may be possible to check whether the refractive index (n １ ) is set to a refractive index nx that is a value larger than the reference lens, and Δt is calculated from the lens shape of the lens other than the reference lens generated under that condition, and Δt is calculated when Δt is t Ｔ If Δt is equal to or less than t, the refractive index nx is set as the first refractive index. ＴWhen the maximum thickness calculated from the lens shape of the lens other than the reference lens is greater than the maximum thickness of the reference lens, the refractive index nx is set to a smaller value and the lens shape is generated again. Ｔ If the maximum thickness calculated from the lens shape of the lens other than the reference lens is smaller than the maximum thickness of the reference lens, the refractive index nx is set to a larger value and the lens shape is generated again. Ｔ The first refractive index can be obtained by repeating the process until the following value is obtained:

[0025] When step S16 is completed, the process proceeds to step S 17. After steps S15 and S16 are performed, the refractive index calculation step described above is performed.

[0026] In step S17, a relational expression between the mixing ratio of the first material and the second material and the refractive index is obtained. As described above, the second material is a material with a lower refractive index than the first material. By using a mixture of the first material and the second material, a material with a lower refractive index than the first material can be obtained. The relational expression between the mixing ratio of the first material and the second material and the refractive index is, for example, a function with the mixing ratio as an independent variable. In other words, the relational expression is a function in which the refractive index is determined by the value of the mixing ratio.

[0027] The method for obtaining the above relational expression is not particularly limited, and examples thereof include the following methods. First, the refractive index of a member formed by varying the mixing ratio of the first material and the second material is measured in advance to obtain the relationship between the mixing ratio and the refractive index. From the relationship between the mixing ratio and the refractive index, a plot of the refractive index versus the mixing ratio is created. A curve or a straight line is obtained from the obtained plot using a predetermined method, and the equation of the curve or line is used as the relational expression. One method for obtaining the equation of the curve or line is to use the obtained plot to obtain an approximation curve or an approximation straight line using a known method such as the least squares method. Another method for obtaining the equation of the line may be to obtain the equation of a line connecting two adjacent points on the obtained plot, and use the equation as the equation of the line between the two points. The relational expression may be different depending on the range of the mixing ratio. The mixing ratio may be, for example, the content of the first material relative to the total content of the first material and the second material. Specific examples of this method are described below.

[0028] The relationship between the mixing ratio and the refractive index may be stored in the storage unit 20 or may be input from the input unit 16. The relational expression may be an expression stored in advance in the storage unit 20.

[0029] When step S17 is completed, the process proceeds to step S18.

[0030] In step S18, the mixing ratio of the first material and the second material is calculated using the relational expression obtained in step S17. For example, the mixing ratio calculation unit 30 calculates the mixing ratio that results in the refractive index by setting the refractive index to a fixed value for the relational expression. The calculated mixing ratio may be stored in the storage unit 20 or may be displayed on the display unit 14. When step S18 is completed, this design method ends. Note that when steps S17 and S18 are performed, the above-mentioned mixing ratio calculation process is performed.

[0031] When step S18 is completed and this design method is finished, the lens design information and the mixing ratio of the first material and the second material in the mixture containing the first material and the second material that constitutes the spectacle lens that will be the reference lens and the lenses other than the reference lens are obtained. Based on the above information, the reference lens and the lenses other than the reference lens can be manufactured.

[0032] A more specific example of this design method will be described below. Hereinafter, this more specific example of this design method will also be simply referred to as "this example." First, lens design information is acquired in which the distance power is -9.00 D for the spectacle lens for the right eye and -8.00 D for the spectacle lens for the left eye (step S11). The lens design information is input via the input unit 16 and stored in the storage unit 20.

[0033] Next, the maximum thickness of the right-eye spectacle lens, t Ｒ The shape (circular shape) of the spectacle lens for the right eye is assumed to be circular.

[0034]

[0035] In formula (A), t ｍａｘ is the maximum thickness of the right eye spectacle lens (t Ｒ In formula (A), t ｍｉｎ is the minimum thickness of the spectacle lens for the right eye, and in this example, t ｍｉｎ = 2.0 mm is used. In formula (A), r is the radius of the circular spectacle lens for the right eye, and in this example, r = 40 mm is used. In formula (A), Pw is the power of the spectacle lens for the right eye, and in this example, Pw = 9.00 is used. In formula (A), n ｇ is the refractive index, and in this example, n １ = 1.659 is used. The refractive index of the first material is the refractive index of the cured product of the first liquid composition. The first liquid composition contains 1 mass % of Omnicure TPO (IGM Resins) and 1 mass % of Irgcure 819 (IGM Resins) relative to the total mass of the first liquid composition, with the remainder being t-butyl methacrylate. When the first material is irradiated with ultraviolet light, a cured product of the first material is obtained.

[0036] Substituting each value into the above formula (A), t ｍａｘ (t Ｒ ) is calculated to be 12.9 mm (step S12). Similarly, using formula (A), the maximum thickness of the spectacle lens for the left eye, t Ｌ That is, when the maximum thickness is calculated in the same manner as above except that the value of Pw is set to 8.00 in the above procedure, t ｍａｘ (t Ｌ ) becomes 11.7 mm (step S13).

[0037] t Ｒ -t Ｌ Calculating the absolute value of Δt, Δt is 1.2 mm. Ｔ is set to 0.15 mm, Δt is t Ｔ (Step S14). Therefore, the reference lens is set as the spectacle lens for the right eye (Step S15).

[0038] Next, the first refractive index of the lens (the spectacle lens for the left eye) other than the reference lens, for which Δt is 0.0 mm, is calculated. Specifically, in the above formula (A), n ｇ Without substituting t ｍａｘ The value of n is set to 12.9 mm. ｇ Since all other values ​​are constants, ｇ The value (first refractive index) can be calculated, and the value is approximately 1.587 (step S16).

[0039] In addition, a relational expression between the previously obtained mixing ratio of the first material and the second material and the refractive index is obtained. Specifically, the first material (refractive index n １ = 1.659), and the second material (refractive index n ２The relationship between the mixing ratio of the first and second materials (i.e., 1.574) and the refractive index is measured in advance. The refractive index of the second material is the refractive index of a cured product of the second liquid composition. The second liquid composition contains 1% by mass of Omnicure TPO (IGM Resins) and 1% by mass of Irgcure 819 (IGM Resins) relative to the total mass of the second liquid composition, with the remainder being isobornyl methacrylate. When the second material is irradiated with ultraviolet light, a cured product of the second material is obtained. Note that the refractive index of a cured product formed using only the first material is 1.659, the refractive index of a cured product of a mixture obtained by mixing the first and second materials at a mass ratio of 1:1 is 1.584, and the refractive index of a cured product formed using only the second material is 1.574. That is, in a mixture containing a first material and a second material, when the mass ratio of the content of the first material to the total content of the first material and the second material (hereinafter also referred to as the "first material mixing ratio") is 0%, the refractive index of the mixture is 1.659. Furthermore, when the first material mixing ratio is 50%, the refractive index of the mixture is 1.584, and when the first material mixing ratio is 100%, the refractive index of the mixture is 1.659. From the plot (three points) of the refractive index of the mixture versus the first material mixing ratio, two line segments connecting adjacent points are drawn, and the equations of the two line segments are each determined. The above-obtained equation is obtained as the relationship between the mixing ratio of the first material and the second material and the refractive index (step S17).

[0040] Next, the calculated first refractive index value of 1.587 is substituted into the above equation to calculate the mixture ratio of the first material and the second material. As a result, the mixture ratio of the first material and the second material (first material mixture ratio) is calculated to be 65% by mass (step S18). That is, if the content of the first material: the content of the second material is set to 65:35, the refractive index of the mixture is calculated to be 1.587.

[0041] The maximum thickness of the lenses (spectacles lenses for the left eye) other than the reference lens produced using the mixture with the above mixing ratio determined by the above procedure will be approximately equal to the maximum thickness of the reference lens (spectacles lenses for the right eye).

[0042] On the other hand, for example, when the right-eye and left-eye spectacle lenses are manufactured using only the first material, the difference in maximum thickness is 1.2 mm as described above. Also, when the right-eye and left-eye spectacle lenses are manufactured using only the second material, the difference in maximum thickness can be calculated in the same manner as above using the above formula (A), and the value is 1.4 mm.

[0043] On the other hand, if the right-eye spectacle lens is made using only the first material and the left-eye spectacle lens is made using only the second material, the maximum thickness of the right-eye spectacle lens will be 12.9 mm and the maximum thickness of the left-eye spectacle lens will be 13.1 mm. That is, the difference in maximum thickness will be 0.2 mm, and the maximum thickness of the right-eye spectacle lens and the maximum thickness of the left-eye spectacle lens will not be the same.

[0044] Note that this example is merely an example, and various modifications can be made. For example, when obtaining the relational expression in this example, the number of plotted points may be more than three. The number of plotted points may be four or more, five or more, or even ten or more. There is no particular upper limit to the number of plotted points, but examples include 100 or less. Furthermore, the above relational expression may be obtained from two points, namely, the refractive index of the first material and the refractive index of the second material.

[0045] The first and second materials are not limited to the above examples, and various materials can be used. Preferred requirements for the first and second materials will be described below.

[0046] The difference between the refractive index of the first material and the refractive index of the second material is preferably 0.05 or more, more preferably 0.08 or more. Typically, the refractive index of the mixture can be adjusted within a range from the refractive index of the first material to the refractive index of the second material. The upper limit of the refractive index difference is not particularly limited, but may be, for example, 0.30 or less, and is often 0.20 or less. The refractive index of the first material refers to the refractive index of the cured product of the first material. The refractive index of the second material refers to the refractive index of the cured product of the second material.

[0047] The refractive index of the first material is preferably 1.400 or more, more preferably 1.500 or more, even more preferably 1.600 or more, and particularly preferably 1.650 or more. There is no particular upper limit to the refractive index of the first material, but it is, for example, 2.200 or less, and in many cases 2.000 or less.

[0048] The refractive index of the second material is preferably 1.300 or more, more preferably 1.400 or more, even more preferably 1.500 or more, and may be 1.550 or more. There is no particular upper limit to the refractive index of the second material, but it is, for example, 2.000 or less, preferably less than 1.650, and more preferably less than 1.600. The refractive index of the second material is lower than the refractive index of the first material. The refractive index of the second material is also set to be lower than the first refractive index calculated in step S16. That is, the refractive index of the second material is lower than the refractive index of the first material and lower than the first refractive index.

[0049] The first and second materials are preferably curable. Curability refers to the property of changing from a fluid state to a solid state through hardening. Examples include photocurability, which hardens when irradiated with light, and thermosetting, which hardens when heated. Methods for imparting photocurability to the first and second materials include incorporating a polymerizable material or a photopolymerization initiator that generates active species when irradiated with light (e.g., ultraviolet light) into the first and second materials. Examples of polymerizable materials include known compounds (e.g., polymerizable monomers) having polymerizable groups. Examples of polymerizable groups include vinyl groups, acrylic groups, methacrylic groups, styryl groups, epoxy groups, episulfide groups, and oxetanyl groups. Specific examples of polymerizable materials include acrylic acid monomers, methacrylic acid monomers, epoxy monomers, and epoxy oligomers. Polymerizable materials capable of forming resins that can be used to form eyeglass lenses, as described below, are also preferred. The refractive index of the first and second materials can be adjusted depending on the type of polymerizable material. The photopolymerization initiator may be an anionic polymerization initiator, a cationic polymerization initiator, or a radical polymerization initiator. Known compounds can be used as the photopolymerization initiator.

[0050] Furthermore, methods for imparting thermosetting properties to the first material and the second material include a method of incorporating a polymerizable material and a thermal polymerization initiator that generates active species when heated into the first material and the second material. Examples of the polymerizable material include known compounds having a polymerizable group (e.g., polymerizable monomers). Examples of the polymerizable group include the groups described above. The thermal polymerization initiator may be a cationic polymerization initiator or a radical polymerization initiator. Known compounds can be used as the thermal polymerization initiator.

[0051] It is also preferable that both the first material and the second material are photocurable or thermosetting.

[0052] It is also preferable that the first material and the second material are compatible with each other, i.e., when the first material and the second material are mixed in any ratio, it is preferable that no phase separation occurs regardless of the ratio.

[0053] The first material and the second material may contain components other than those described above. Examples of components that the first material and the second material may contain include a refractive index adjuster, a bluing agent, a light stabilizer, a dye, and an antioxidant. When the first material and the second material contain a refractive index adjuster, the refractive index of each material can be adjusted. The refractive index adjuster may be composed of an inorganic material or an organic material. Examples of refractive index adjusters composed of inorganic materials include silicon oxide particles, titanium oxide particles, zirconium oxide particles, and tin oxide particles. Examples of refractive index adjusters composed of organic materials include carbazole and carbazole derivatives, fluorene and fluorene derivatives, phenanthrene and phenanthrene derivatives, and benzoquinoline and benzoquinoline derivatives.

[0054] When at least one of the first material and the second material contains a refractive index adjuster, only the first material may contain the refractive index adjuster, only the second material may contain the refractive index adjuster, or both the first material and the second material may contain the refractive index adjuster.

[0055] The mixture may contain components other than the first material and the second material, such as the components that the first material and the second material may contain, other than the refractive index adjuster.

[0056] Although the procedure for carrying out this design method has been described above in accordance with the flowchart shown in FIG. 2, various modifications may be made to the method. The procedure for carrying out this design method in a modified example will be described using the flowchart shown in FIG. 3. FIG. 3 is a flowchart showing a modified example of the method for designing an eyeglass lens according to an embodiment of the present disclosure in order of steps. Note that, in the modified example for carrying out this design method shown in FIG. 3, a method for carrying out this design method using the design device 10 described above will be described, as with the flowchart shown in FIG. 2. In the modified example for carrying out this design method shown in FIG. 3, a eyeglass lens is designed by carrying out this design method using the design device 10, as with the flowchart shown in FIG. 2.

[0057] The flowchart shown in Fig. 3 differs from the flowchart shown in Fig. 2 in that steps S17 and S18 in Fig. 2 are replaced by steps S17a and S18a, respectively. In the flowchart shown in Fig. 3, steps S11 to S16 are performed in the same manner as in the flowchart shown in Fig. 2. Therefore, detailed description of steps S11 to S16 will be omitted.

[0058] In the flowchart shown in FIG. 3 , step S17a acquires a relationship table between the mixing ratio of the first material and the second material in a mixture containing the first material and the second material and the refractive index. The relationship table is created in advance and may be stored in the storage unit 20 or input via the input unit 16. The relationship table holds a correspondence between the mixing ratio and the refractive index of the mixture at that mixing ratio. The relationship table is preferably created so that the mixing ratio changes at a predetermined rate. For example, the relationship table is preferably a relationship table in which the mixing ratio is the content of the first material relative to the total content of the first material and the second material, and the mixing ratio changes in increments of 25% by mass (more preferably, in increments of 20%, 10%, 5%, etc.) between 0 and 100% by mass. After step S17a is completed, the process proceeds to step S18a.

[0059] In the flowchart shown in FIG. 3 , in step S18a, the mixing ratio of the first material and the second material is selected from the relationship table. Specifically, from the obtained relationship table, the mixing ratio that results in the refractive index closest to the first refractive index calculated in step S16 is selected. If there are two values ​​closest to the first refractive index, either corresponding mixing ratio may be selected. The selected mixing ratio may be stored in the storage unit 20 or displayed on the display unit 14. When step S18a is completed, this design method ends. Note that when steps S17a and S18a are performed, the above-mentioned mixing ratio calculation process is performed.

[0060] 2, when step S18a is completed and the design method is terminated, the lens design information and the mixing ratio of the first material and the second material in the mixture containing the first material and the second material that constitutes the spectacle lens that will be the reference lens and lenses other than the reference lens are obtained. Based on the above information, the reference lens and lenses other than the reference lens can be manufactured.

[0061] The eyeglass lens design method of the present disclosure may include a first material selection step for a material to be used as the first material, before the lens thickness calculation step. The eyeglass lens design method of the present disclosure may also include a second material selection step for a material to be used as the second material, between the refractive index calculation step and the mixing ratio calculation step. In the second material selection step, a second material having a refractive index lower than the first refractive index calculated in the refractive index calculation step is selected. Examples of the first material and the second material are as described above.

[0062] <Method for manufacturing eyeglass lenses> The method for manufacturing eyeglass lenses of the present disclosure manufactures lenses other than the reference lens using a mixture having the above-mentioned mixing ratio determined by the method for designing eyeglass lenses of the present disclosure. In other words, lenses other than the reference lens are manufactured using a mixture containing the first material and the second material in the mixing ratio determined by the method for designing eyeglass lenses of the present disclosure.

[0063] The method for manufacturing lenses other than the reference lens is not particularly limited, and known methods can be applied. For example, a lens other than the reference lens having a predetermined shape may be formed by pouring resin into a mold having the shape of the lens other than the reference lens obtained in the above-described spectacle lens design method and hardening the resin. Another method for manufacturing lenses other than the reference lens may be to obtain the shape of the lens other than the reference lens obtained in the above-described spectacle lens design method, and then cut a semi-finished lens based on that shape to manufacture the lens other than the reference lens. Another method for manufacturing lenses other than the reference lens may be to manufacture lenses other than the reference lens by a three-dimensional modeling method (also referred to as 3D printing) based on the obtained shape of the lens other than the reference lens. Known methods can be selected for the three-dimensional modeling method, and examples include a stereolithography method, a powder modeling method, a fused deposition modeling method, and an inkjet method.

[0064] In the method for manufacturing a spectacle lens according to the present disclosure, the obtained lenses other than the reference lens may be further subjected to polishing or the like. Furthermore, a step of forming the configuration of the spectacle lens described below may be carried out. For example, the method may include a step of forming one or more configurations selected from the group consisting of a primer layer, a hard coat layer, an anti-reflection layer, and a water- and oil-repellent layer.

[0065] In the method for manufacturing a spectacle lens according to the present disclosure, a reference lens may be manufactured. The reference lens is preferably formed using the first material described above. Methods for manufacturing a reference lens using the first material include methods similar to the methods for manufacturing lenses other than the reference lens described above. In addition, in the method for manufacturing a spectacle lens according to the present disclosure, the obtained reference lens may be further polished or the like. In addition, a step of forming the configuration of the spectacle lens described below may be performed.

[0066] <Eyeglass Lens> An eyeglass lens manufactured by the eyeglass lens manufacturing method of the present disclosure will be described. The eyeglass lens has an eyeglass lens substrate, and may have one or more structures selected from the group consisting of a primer layer, a hard coat layer, an anti-reflection film, and a water- and oil-repellent layer on its surface. The one or more structures may be formed on only one side of the eyeglass lens substrate, or on both sides of the eyeglass lens substrate. The eyeglass lens will be described below.

[0067] [Eyeglass Lens Substrate] The eyeglass lens substrate of the reference lens contains at least the first material described above. Furthermore, eyeglass lenses other than the reference lens contain the first and second materials described above. Examples of materials constituting the eyeglass lens substrate include acrylic resin, thiourethane resin, methacrylic resin, allyl resin, episulfide resin, polycarbonate resin, polyurethane resin, polyester resin, polystyrene resin, polyethersulfone resin, polymethylpentene resin, diethylene glycol bisallyl carbonate resin, polyvinyl chloride resin, epoxy resin, and sulfur-containing copolymer.

[0068] The thickness of the spectacle lens substrate is not particularly limited, but is often about 1 to 30 mm. The refractive index of the spectacle lens substrate is not particularly limited, but is preferably 1.300 or more, more preferably 1.400 or more, even more preferably 1.500 or more, and may be 1.550 or more. The spectacle lens substrate may be dyed.

[0069] [Primer Layer] The spectacle lens may include a primer layer. The primer layer is preferably disposed between the spectacle lens substrate and the hard coat layer described below. When the primer layer is disposed between the spectacle lens substrate and the hard coat layer, it improves the adhesion of the hard coat layer to the spectacle lens substrate and improves the strength of the spectacle lens having an anti-reflection film disposed on the hard coat layer against static load or impact. The material constituting the primer layer is not particularly limited, and known materials can be used, for example, resins are mainly used. The type of resin used is not particularly limited, and examples include polyurethane-based resins, epoxy-based resins, phenol-based resins, polyimide-based resins, polyester-based resins, bismaleimide-based resins, and polyolefin-based resins, with polyurethane-based resins being preferred. The primer layer may contain components other than the above resins. Examples of other components include fine particles of an oxide of at least one metal selected from Si, Al, Sn, Sb, Ta, Ce, La, Fe, Zn, W, Zr, In, and Ti, or fine particles of a composite oxide thereof, a hydrolyzable silicon compound and / or its hydrolyzed condensate, a conductive filler, and a surfactant.

[0070] The method for forming the primer layer is not particularly limited, and known methods can be used, such as a method in which a primer layer-forming composition containing a predetermined resin is applied to a spectacle lens substrate, and a curing treatment is performed as necessary to form a primer layer. The method for applying the primer layer-forming composition is not particularly limited, and examples thereof include a method exemplified by the method of applying a hard coat layer-forming composition described below to a spectacle lens substrate. The thickness of the primer layer is not particularly limited, but is preferably 0.3 to 2 μm.

[0071] [Hard Coat Layer] The eyeglass lens may include a hard coat layer. The hard coat layer is preferably disposed between the eyeglass lens substrate and the anti-reflection film, and is a layer that imparts scratch resistance to the eyeglass lens substrate. The hard coat layer preferably exhibits a pencil hardness of "H" or higher according to the test method defined in International Standard ISO 15184 and Japanese Industrial Standard JIS K5600, which was created based on this international standard.

[0072] As the hard coat layer, a known hard coat layer can be used, for example, an organic hard coat layer, an inorganic hard coat layer, or an organic-inorganic hybrid hard coat layer. For example, in the field of eyeglass lenses, an organic-inorganic hybrid hard coat layer is commonly used.

[0073] The hard coat layer preferably contains a polymer of a polymerizable monomer (a polymer obtained by polymerizing a polymerizable monomer) and / or a condensate of a hydrolyzable organosilicon compound. The polymerizable monomer is not particularly limited, but examples thereof include (meth)acrylates having at least one group selected from the group consisting of phosphate groups and sulfonic acid groups, silsesquioxanes having radical polymerizable groups, polyfunctional acrylates, compounds having multiple epoxy groups, and silsesquioxane compounds having oxetanyl groups. Note that (meth)acrylate refers to acrylate or methacrylate. The hydrolyzable organosilicon compound is not particularly limited, but examples thereof include organosilicon compounds having epoxy groups.

[0074] The hard coat layer may also contain inorganic components such as metal oxide fine particles. The type of metal oxide fine particles is not particularly limited, and examples include known metal oxide fine particles. Examples of metal oxide fine particles include fine particles of at least one metal oxide selected from Si, Al, Sn, Sb, Ta, Ce, La, Fe, Zn, W, Zr, In, and Ti. Among these, in terms of ease of handling, metal oxide fine particles are preferably fine particles of oxides containing Si (silicon oxide fine particles), oxides containing Sn (tin oxide fine particles), oxides containing Zr (zirconium oxide fine particles), or oxides containing Ti (titanium oxide fine particles). The metal oxide fine particles may contain only one of the above-mentioned metals (metal atoms) or two or more metals (metal atoms). Although Si (silicon) is sometimes classified as a semimetal, in the present disclosure, Si is considered to be included in the metals.

[0075] The hard coat layer is preferably formed using a hard coat layer-forming composition containing a polymerizable monomer. The hard coat layer-forming composition may contain, in addition to the polymerizable monomer, the metal oxide fine particles, other components, and a solvent. Examples of other components include a radical polymerization initiator, a cationic polymerization initiator, and a curing catalyst. Other components may also include various additives, such as UV absorbers, antioxidants, coating modifiers, light stabilizers, antioxidants, color inhibitors, dyes, fillers, and internal mold release agents, which are added as needed. The solvent may be water or an organic solvent. The type of organic solvent is not particularly limited, and examples 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.

[0076] A method for forming a hard coat layer using a hard coat layer-forming composition includes applying the hard coat layer-forming composition to a spectacle lens substrate (or a primer layer) to form a coating film, and then subjecting the coating film to a curing treatment such as a light irradiation treatment and a heat treatment. As the curing treatment, either one of a light irradiation treatment or a heat treatment may be performed, or both may be performed. When both are performed, the light irradiation treatment and the heat treatment may be performed simultaneously, or one may be performed first and then the other. After forming the coating film, a drying treatment such as a heat treatment may be performed, if necessary, to remove the solvent from the coating film.

[0077] The method for applying the composition for forming a hard coat layer is not particularly limited, and includes known methods (e.g., dipping coating, spin coating, spray coating, inkjet coating, and flow coating). The thickness of the coating film to be formed is not particularly limited, and a thickness that will result in a predetermined hard coat layer thickness is appropriately selected.

[0078] The conditions for the light irradiation treatment are not particularly limited, and appropriate conditions are selected depending on the type of polymerization initiator used. The type of light used for light irradiation is not particularly limited, but examples include ultraviolet light and visible light. Examples of light sources include high-pressure mercury lamps. The cumulative light amount used for light irradiation is not particularly limited, but from the viewpoints of productivity and curability of the coating film, it is preferred to use a light amount of 100 to 3000 mJ / cm. ２ is preferred, and 100 to 2000 mJ / cm ２ The conditions for the heat treatment are not particularly limited, and the optimum conditions are selected depending on the type of polymerization initiator used. The heating temperature is preferably 30 to 100°C, and the heating time is preferably 5 to 360 minutes.

[0079] The thickness of the hard coat layer is not particularly limited, but is preferably 1 μm or more, more preferably 3 μm or more. The upper limit of the thickness can be, for example, 30 μm or less. The thickness is an average thickness, and the measurement method is to measure the thickness at any five points on the hard coat layer and calculate the arithmetic average.

[0080] The hard coat layer may contain additives such as a bluing agent, a light stabilizer, and an antioxidant.

[0081] [Anti-reflection film] The spectacle lens may include an anti-reflection film. An anti-reflection film is a layer that has the function of preventing reflection of incident light. Specifically, an anti-reflection film may have low reflectance characteristics (broadband low reflectance characteristics) over the entire visible range of 380 to 780 nm.

[0082] The anti-reflection film preferably includes a high refractive index layer and a low refractive index layer. In the anti-reflection film, the high refractive index layer and the low refractive index layer are preferably arranged alternately. That is, when the anti-reflection film includes two high refractive index layers and two low refractive index layers, it is preferable that a low refractive index layer is arranged between two high refractive index layers, and a high refractive index layer is arranged between two low refractive index layers. As will be described later, an antistatic layer (e.g., SnO ２ Indium tin oxide (ITO) is indium tin oxide, and indium oxide (In ２ O ３ ) and tin oxide (SnO ２ ) is a mixture of

[0083] The high refractive index layer is preferably a layer having a refractive index of 1.60 or more. The high refractive index layer preferably contains at least one oxide selected from the group consisting of titanium, zirconium, aluminum, niobium, tantalum, and lanthanum. Among these, the high refractive index layer is preferably made of zirconium dioxide (ZrO ２ The high refractive index layer may contain two or more materials.

[0084] The low refractive index layer is preferably a layer having a refractive index of less than 1.60. The low refractive index layer preferably contains at least one selected from the group consisting of silicon oxide, calcium fluoride, and magnesium fluoride. In particular, the low refractive index layer preferably contains silicon dioxide (SiO ２ The low refractive index layer may contain two or more materials.

[0085] The total number of high refractive index layers and low refractive index layers in the antireflection film and preferred embodiments thereof are as described above.

[0086] In the antireflection film, the layer disposed closest to the spectacle lens substrate may be either a low refractive index layer or a high refractive index layer.

[0087] For example, the thickness of each of the high refractive index layers is preferably 5 to 200 nm, more preferably 5 to 150 nm, and even more preferably 8 to 100 nm, and the thickness of each of the low refractive index layers is preferably 10 to 500 nm, more preferably 15 to 450 nm, and even more preferably 20 to 200 nm.

[0088] The method for producing the anti-reflection film is not particularly limited, and examples thereof include dry methods such as vacuum deposition, sputtering, ion plating, ion beam assisted deposition, and CVD.

[0089] The anti-reflection film contains, in addition to the high refractive index layer and the low refractive index layer, SnO ２ The layer may further include a SnO layer or an ITO layer. ２ The SnO layer and the ITO layer can function as an antistatic layer. ２ The positions of the layer and the ITO layer are not particularly limited, and they may be between the high refractive index layer and the low refractive index layer described above.

[0090] [Water- and oil-repellent layer] The eyeglass lens may include a water- and oil-repellent layer. In particular, it is preferable that the eyeglass lens has a water- and oil-repellent layer as the outermost layer. The water- and oil-repellent layer reduces the surface energy of the eyeglass lens, improving the anti-fouling function of the eyeglass lens and improving the slipperiness of the eyeglass lens surface, which in turn improves the abrasion resistance of the eyeglass lens.

[0091] The material constituting the water- and oil-repellent layer is not particularly limited, and examples thereof include fluorine-containing compounds (compounds containing fluorine atoms) and silicon-containing compounds (compounds containing silicon atoms). Among these, the water- and oil-repellent layer preferably contains a fluorine-containing compound, and more preferably contains at least one selected from the group consisting of fluorine-substituted alkyl group-containing organosilicon compounds, their hydrolysates, and their hydrolyzed condensates. The material constituting the water- and oil-repellent layer may be used alone or in combination of two or more.

[0092] The organosilicon compound containing fluorine-substituted alkyl group is the organosilicon compound that contains alkyl group in which part or all of hydrogen atom is replaced by fluorine atom, and has hydrolyzable group.Here, the hydrolyzable group is the group that is directly bonded to silicon atom and can proceed hydrolysis reaction and condensation reaction, for example, alkoxy group, halogen atom, acyloxy group, alkenyloxy group and isocyanate group.It should be noted that when a plurality of hydrolyzable groups are directly bonded to one silicon atom, they can be the same or different.

[0093] The hydrolyzate of a fluorine-substituted alkyl group-containing organosilicon compound refers to a compound obtained by hydrolyzing the hydrolyzable groups in a fluorine-substituted alkyl group-containing organosilicon compound. The hydrolyzate may be one in which all of the hydrolyzable groups are hydrolyzed (complete hydrolyzate) or one 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 a fluorine-substituted alkyl group-containing organosilicon compound refers to a compound obtained by hydrolyzing the hydrolyzable groups in a fluorine-substituted alkyl group-containing organosilicon compound and condensing the resulting hydrolyzate. The hydrolyzed condensate may be one in which all of the hydrolyzable groups are hydrolyzed and the hydrolyzate is completely condensed (complete hydrolyzed condensate), or one in which only a portion of the hydrolyzable groups are hydrolyzed and a portion of the hydrolyzate is condensed (partial hydrolyzed condensate). In other words, the hydrolyzed condensate may be a complete hydrolyzed condensate, a partial hydrolyzed condensate, or a mixture thereof.

[0094] The method for forming the water- and oil-repellent layer is not particularly limited and can be selected as desired depending on the materials used, the desired performance, thickness, etc. Examples include a method in which a water- and oil-repellent layer-forming composition containing a fluorine-substituted alkyl group-containing organosilicon compound is applied to the spectacle lens substrate and cured as needed, and a dry method. Coating methods include, for example, dipping coating, roll coating, bar coating, spin coating, spray coating, die coating, and gravure coating. Curing treatments include, for example, light irradiation treatment, heating treatment, and water vapor contact treatment. Water vapor contact treatments include, for example, contact with air controlled at a humidity of 50 to 90% RH. The above curing treatments may be performed in combination. Examples of dry methods include the same methods as those used for the anti-reflection coating described above.

[0095] The thickness of the water- and oil-repellent layer of the spectacle lens is not particularly limited, but is preferably 5 to 35 nm. If the thickness is within the above range, the spectacle lens will have excellent water- and oil-repellent properties.

[0096] <Applications> The spectacle lenses manufactured by the spectacle lens manufacturing method of the present disclosure are suitable for use as lenses for spectacle lenses. Examples of spectacle lenses include those having a known spectacle frame and spectacle lenses. Examples of spectacle frames include those having a pair of lens frames on which spectacle lenses for the right eye and the left eye are respectively mounted, and temples for holding the spectacle frame over the wearer's ears. Spectacle lenses (specialty lenses for the right eye and the left eye) manufactured by the spectacle lens manufacturing method of the present disclosure can have similar lens thicknesses, which makes it easy to achieve weight balance when applied to eyeglasses. Furthermore, similar lens thicknesses also result in excellent appearance of the eyeglasses.

Claims

1. A method for designing eyeglass lenses, comprising the steps of: calculating the thicknesses of a right-eye eyeglass lens and a left-eye eyeglass lens when the right-eye eyeglass lens and the left-eye eyeglass lens are formed using a first material based on lens design information including power information; determining whether the difference between the thickness of the right-eye eyeglass lens and the thickness of the left-eye eyeglass lens exceeds a predetermined value; and, if the difference exceeds the predetermined value, calculating a first refractive index of a lens other than the reference lens, which has a difference in thickness from the reference lens that is equal to or less than a predetermined value while satisfying the lens design information, when the thicker of the right-eye eyeglass lens and the left-eye eyeglass lens is used as the reference lens; and determining a mixing ratio of the first material and the second material, which is prepared in advance, in a mixture containing the first material and a second material having a refractive index lower than that of the first material, using the relationship between the mixing ratio of the first material and the second material and the refractive index of the mixture, so that the refractive index of the mixture becomes the first refractive index.

2. The method for designing a lens according to claim 1, wherein the difference between the refractive index of the first material and the refractive index of the second material is 0.05 or more.

3. The method for designing a lens according to claim 1 or 2, wherein the difference between the refractive index of the first material and the refractive index of the second material is 0.08 or more.

4. The method for designing a spectacle lens according to any one of claims 1 to 3, wherein the first material and the second material are compatible with each other.

5. The method for designing a spectacle lens according to any one of claims 1 to 4, wherein the first material and the second material are curable.

6. A method for manufacturing eyeglass lenses, which uses the mixture having the mixing ratio determined by the lens design method described in any one of claims 1 to 5 to manufacture lenses other than the reference lens.

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