WO2023127731A1

WO2023127731A1 - Spectacle lens and method for manufacturing spectacle lens

Info

Publication number: WO2023127731A1
Application number: PCT/JP2022/047656
Authority: WO
Inventors: 好徳吉田
Original assignee: 株式会社ニコン・エシロール
Priority date: 2021-12-27
Filing date: 2022-12-23
Publication date: 2023-07-06

Abstract

A spectacle lens (20A) comprises: a first lens part (21) that is a concave lens formed by at least a first material; a second lens part (22) that is a convex lens disposed within the first lens part and formed by at least a second material. The first material has a first refractive index, and the second material has a second refractive index larger than the first refractive index. The first lens part has a plurality of first unit elements (21a) formed by at least the first material, and the plurality of first unit elements are united. The second lens part has a plurality of second unit elements (22a) formed by at least the second material, and the plurality of second unit elements are united.

Description

Spectacle lens and spectacle lens manufacturing method

The present invention relates to a spectacle lens and a method for manufacturing a spectacle lens.
This application claims priority based on Japanese Patent Application No. 2021-212736 filed on December 27, 2021, the contents of which are incorporated herein.

Conventionally, spectacle lenses that suppress the progression of myopia are known.

U.S. Patent Application Publication No. 2017/0131567 WO2019/189764 WO2019/124352 WO2020/069232

A first aspect of the spectacle lens of the present invention includes: a first lens portion which is a concave lens made of at least a first material; a lens portion, wherein the first material has a first refractive index and the second material has a second refractive index greater than the first refractive index, the first lens portion comprising: It has a plurality of first unit elements made of at least the first material, the plurality of first unit elements are integral, and the second lens portion comprises a plurality of second lenses made of at least the second material. It has two unit elements, and the plurality of second unit elements are integral.

A second aspect of the spectacle lens of the present invention includes: a first lens portion which is a concave lens made of at least a first material; a lens portion, wherein the first material has a first refractive index and the second material has a second refractive index less than the first refractive index, the first lens portion comprising: It has a plurality of first unit elements made of at least the first material, the plurality of first unit elements are integral, and the second lens portion comprises a plurality of second lenses made of at least the second material. It has two unit elements, and the plurality of second unit elements are integral.

A first aspect of the spectacle lens manufacturing method of the present invention includes: a first lens portion that is a concave lens made of at least a first material; and a convex lens that is disposed within the first lens portion and made of at least a second material. a second lens portion, wherein the first material has a first refractive index, and the second material has a second refractive index greater than the first refractive index; Manufactured according to the law.

A second aspect of the spectacle lens manufacturing method of the present invention comprises: a first lens portion which is a concave lens made of at least a first material; and a concave lens placed in the first lens portion and made of at least a second material. a second lens portion, wherein the first material has a first refractive index and the second material has a second refractive index smaller than the first refractive index; Manufactured according to the law.
An inkjet 3D printer can be used as the layered manufacturing method.

1 is a perspective view of spectacles provided with spectacle lenses according to an embodiment of the present invention; FIG. It is a front view of the said spectacle lens. 3 is a cross-sectional view taken along a cutting line A1-A1 in FIG. 2; FIG. It is a perspective view which shows typically the 3D printer used for manufacturing the said spectacle lens. It is sectional drawing which shows the state in which the inkjet head in the said 3D printer sprays ink. It is a sectional view showing the state where the ink-jet head in the above-mentioned 3D printer smoothes and hardens ink. FIG. 2 is a cross-sectional view of a main part of the spectacle lens; 1 is a cross-sectional view of a patient's eye; FIG. FIG. 10 is a front view of a spectacle lens in a first modified example of one embodiment of the present invention; FIG. 11 is a front view of a spectacle lens in a second modified example of one embodiment of the present invention;

An embodiment of spectacles provided with spectacle lenses and a method for manufacturing spectacle lenses according to the present invention will be described below with reference to FIGS. 1 to 10 .
As shown in FIG. 1, spectacles 1 include a spectacle frame 10 and a pair of

spectacle lenses

20 and 30 of the present embodiment.
The spectacle frame 10 is a frame with a known configuration. For example, the spectacle frame 10 is formed symmetrically with respect to the reference plane. The spectacle frame 10 has a pair of rims 11 , a bridge 12 , a pair of nose pads 13 , a pair of hinges 14 and a pair of temples 15 .
1, one nose pad 13 and one hinge 14 are not shown.

Each rim 11 is ring-shaped. The pair of rims 11 are arranged apart from each other along an orthogonal plane orthogonal to the reference plane. Within each rim 11 is mounted a

spectacle lens

20,30.
The bridges 12 are rod-shaped and extend along orthogonal planes. A bridge 12 is arranged between a pair of limbs 11 . A portion of the outer periphery of each rim 11 is fixed to each end of the bridge 12 .
Each nose pad 13 is provided near the portion of each rim 11 where the bridge 12 is provided. The nose pad 13 contacts the upper part of the nose of the user of the spectacles 1 .

Each hinge 14 has a first wing and a second wing, not shown. The second blade is rotatable relative to the first blade. The first blade is fixed to another portion of the outer peripheral edge of each rim 11 . Each hinge 14 is arranged to

sandwich spectacle lenses

20 and 30 with the bridge 12 .
Each temple 15 is formed in a bar shape and extends in a direction crossing each rim 11 (spectacle lenses 20, 30). A first end of each temple 15 is secured to a second wing of each hinge 14 . The hinge 14 allows the temple 15 to open and close relative to the rim 11 (rotate around the hinge 14). A second end opposite the first end of each temple 15 is placed over each ear of the user.

As will be described later, the

spectacle lenses

20 and 30 of the present embodiment can be used to correct myopia of the patient using the spectacles 1 . The configuration of the

spectacle lenses

20 and 30 is appropriately determined according to the patient's myopia condition. In this example, the

spectacle lenses

20, 30 are similar in construction to correct myopia in both eyes of the patient. Therefore, the spectacle lens 20 will be described below.
For example, in the case of correcting only the myopia of the eye corresponding to the spectacle lens 20 of the patient, only the spectacle lens 20 is the spectacle lens of the present embodiment, and the spectacle lens 30 has the second lens portion 32 described later. Ordinary lenses that do not have

As shown in FIGS. 2 and 3, the spectacle lens 20A includes a first lens portion 21 and a plurality of second lens portions 22. As shown in FIGS. The spectacle lens 20A shown in FIGS. 2 and 3 is in a state before processing the spectacle lens 20 to match the shape of the rim 11 of the spectacle frame 10 (before edging). In FIG. 2 and below, a portion of the cross section is not hatched.
The first lens unit 21 is a concave meniscus lens (concave lens). The first lens portion 21 has a circular shape when viewed along the optical axis C1 of the first lens portion 21 . The concave lens is not limited to a concave meniscus lens, and may be a biconcave lens, a plano-concave lens, or the like. The first lens portion 21 is made of a first material having a first refractive index. In addition, the refractive index shown below is a refractive index at the time of measuring with a mercury e-line (546.07 nm).

Each second lens portion 22 is a so-called microlens for the first lens portion 21 . In this example, each second lens portion 22 is a biconvex lens (convex lens). Each second lens portion 22 is formed of a second material having a second refractive index greater than the first refractive index. The difference in refractive index between the first refractive index and the second refractive index is preferably 0.0001 (1/10000) or more, more preferably 0.001 (1/1000) or more. The difference between the first refractive index and the second refractive index can preferably be 0.01 or more. The difference between the first refractive index and the second refractive index can preferably be 0.1 or more.
The plurality of second lens units 22 are arranged inside the first lens unit 21 . That is, the plurality of second lens portions 22 are not exposed to the outside of the first lens portion 21 . There is no unevenness due to the plurality of second lens portions 22 on the outer surface of the first lens portion 21 facing the direction of the optical axis C1 or the inner surface facing opposite to the optical axis C1.

As shown in FIG. 2, when the spectacle lens 20A is viewed in the direction along the optical axis C1, the plurality of second lens portions 22 are arranged in a first annular region R1 centered on the optical axis C1. . The second lens portion 22 is not arranged near the optical axis C1. The plurality of second lens portions 22 are spaced apart from each other and arranged so that each second lens portion 22 is positioned at the center of each hexagonal element that constitutes the honeycomb structure.
Since the outer surface of the first lens portion 21 facing the direction of the optical axis C1 does not have unevenness due to the plurality of second lens portions 22, a coating layer or the like can be easily provided on these outer surfaces. Moreover, the same applies to the inner surface side.
The convex lens is not limited to a biconvex lens, and may be a plano-convex lens, a convex meniscus lens, or the like. One may be sufficient as the number of the 2nd lens parts 22 with which 20 A of spectacle lenses are provided.

For example, the first lens part 21 and the plurality of second lens parts 22 are formed using a resin material that is transparent and hardened by energy ray irradiation or heat. The energy ray is not particularly limited, but includes, for example, light. When light is used as the energy ray, preferably ultraviolet light can be used. Hereinafter, the case of irradiating ultraviolet rays will be described as an example, but embodiments of the present invention are not limited to ultraviolet rays. In addition, when curing is performed by irradiating ultraviolet rays, an ultraviolet curable material, which is a resin material that is cured by ultraviolet rays, is used for the first material and the second material.

A UV-curable material contains a polymerizable compound and a photopolymerization initiator. The polymerizable compound is not particularly limited as long as a cured product having the first refractive index or the second refractive index can be obtained by polymerization. The polymerizable compound is, for example, a radical polymerizable compound capable of radical polymerization.

Examples of radically polymerizable compounds include (meth)acrylic monomers having a (meth)acryloyl group. (Meth)acrylic monomers include ethoxylated bisphenol A di(meth)acrylate, propoxylated bisphenol A di(meth)acrylate, ethoxylated bisphenol F di(meth)acrylate, 9,9-bis[4-(2-acryloyl) oxyethoxy)phenyl]fluorene, 2,2,4-trimethylhexamethylenebis(2-carbamoyloxyethyl)dimethacrylate, isobornyl (meth)acrylate, 4-(meth)acryloylmorpholine, dicyclopentanyl (meth)acrylate, 4-tert-butylcyclohexyl (meth)acrylate, lauryl (meth)acrylate, phenyl (meth)acrylate, benzyl (meth)acrylate, phenoxyethylene glycol (meth)acrylate, phenoxydiethylene glycol (meth)acrylate and the like.

The type and content of the radical polymerizable compound in the ultraviolet curable material can be appropriately selected according to the viscosity of the ultraviolet curable material and the refractive index after curing.

As the polymerizable compound, a radically polymerizable compound is exemplified, but a cationically polymerizable compound such as an oxetane resin having an oxetane ring may also be used as the polymerizable compound.

The photopolymerization initiator is not particularly limited as long as it generates radicals at the wavelength of the irradiated light (here, the wavelength of ultraviolet rays). Examples of photopolymerization initiators include benzoin, benzoin methyl ether, benzoin butyl ether, benzophenol, acetophenone, 4,4'-dichlorobenzophenone, diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropane-1- on, benzyl methyl ketal, 1-(4-isopropylphenyl)-2-hydroxy-2-methylpropan-1-one, 1-hydroxycyclohexylphenyl ketone, 2-isopropylthiooxanthone, bis(2,4,6- trimethylbenzoyl)-phenylphosphine oxide, 2,4,6-trimethylbenzoyldiphenyl-phosphine oxide and the like.

When the polymerizable compound is a cationic polymerizable compound, a photocationic polymerizing agent that generates an acid at the wavelength of the light to be irradiated can preferably be used. Examples of photocationic polymerization agents include aromatic sulfonium salts, aromatic iodonium salts, aromatic diazonium salts, and aromatic ammonium salts.

The ultraviolet curable material may contain components other than the polymerizable compound and the photopolymerization initiator. Other components include coupling agents such as silane coupling agents (eg, 3-acryloxypropyltrimethoxysilane), rubber agents, ion trapping agents, ion exchange agents, leveling agents, plasticizers, antifoaming agents, and the like. agents.

An example of the refractive index of the first lens portion 21 made of an ultraviolet curable material is 1.50 to 1.70.

For example, by introducing inorganic (mineral) nanoparticles into a UV curable material, the refractive index of the UV curable material can be increased. Inorganic nanoparticles with a refractive index between 2.1 and 3 can be selected from ZrO2, TiO2, BaTiO3, or ZnS, although other inorganic compounds may also be used.
For example, the ultraviolet curable material that is the second material may further contain the inorganic nanoparticles. By containing inorganic nanoparticles, the refractive index can be increased up to about 1.9. For example, an example of the refractive index of the second lens portion 22 formed by adding inorganic nanoparticles to an ultraviolet curable material is 1.60 or more. The ultraviolet curable material of the first material may contain the inorganic nanoparticles.
A refractive index of 1.50 to 1.70 or more can also be obtained by introducing, for example, sulfur element, bromine element, or a cyclic compound, as a method other than the introduction of the nanoparticles.
The same applies to the third material, the material having the fourth refractive index, the material forming the fifth lens portion 46, and the like, which will be described later.

For example, the spectacle lens 20A configured as described above is manufactured by the layered manufacturing method.
A 3D printer (three-dimensional printer) such as an inkjet method (material injection method) can be used as the layered manufacturing method. As an inkjet 3D printer, for example, J826 (manufactured by Stratasys) is used.
Here, an example of a 3D printer will be described using an inkjet type 3D printer as an example.

As shown in FIG. 4, the 3D printer 100 has a Z movement mechanism 101, a stage 102, an inkjet head 103, and an XY movement mechanism (not shown).
For example, the Z movement mechanism 101 has a main body 101a and a support member 101b.
In the main body 101a, a drive motor, a linear guide, and the like (not shown) are incorporated in a housing (not shown).
The support member 101b is arranged above the main body 101a.
When the drive motor is driven, the support member 101b moves in the direction Z with respect to the housing of the main body 101a by being guided by the linear guide. The Z movement mechanism 101 is arranged so that the direction Z extends along the vertical direction.

The stage 102 is flat. The stage 102 is arranged above the support member 101b and fixed to the support member 101b. The stage 102 supports the spectacle lens 20A and the like from below the spectacle lens 20A.

As shown in FIG. 5, the inkjet head 103 has a main body 106, a plurality of nozzles 107, a roller 108, and a UV lamp 109.
In the main body 106, a housing (reference numerals omitted) incorporates a plurality of ink cartridges, a control circuit for controlling a plurality of nozzles 107, and the like.
A plurality of ink cartridges contain ink I for manufacturing the

lens portions

21 and 22, respectively. One of the plurality of inks I is an ink IA having a first refractive index when cured for manufacturing the first lens portion 21 . Another one of the plurality of inks I is an ink IB having a second refractive index when cured for manufacturing the plurality of second lens portions 22 .

A plurality of nozzles 107 and UV lamps 109 are fixed to the bottom surface of the body 106 .
The plurality of nozzles 107 includes nozzles 107A for spraying ink IA and nozzles 107B for spraying ink IB. Each nozzle 107 sprays each ink I downward.
The UV lamp 109 emits UV downward.

The first layer 25 and the second layer 26 are parts of the spectacle lens 20A that are made in the process of manufacturing the spectacle lens 20A. The first layer 25 is formed of a first material having a first refractive index and a second material having a second refractive index. The second layer 26 is also similar to the first layer 25 .
A first layer 25 is placed on the stage 102 . A second layer 26 is laminated on the first layer 25 .

The XY moving mechanism is configured similarly to the Z moving mechanism 101 . The XY moving mechanism moves the inkjet head 103 in directions X and Y that are perpendicular to the direction Z and perpendicular to each other. Note that the direction X, the direction Y, and the direction Z may be directions that intersect each other.
Direction X and direction Y are directions along the horizontal plane.

The 3D printer 100 configured as described above operates, for example, as follows.
As shown in FIG. 5, droplets of ink I are sprayed onto the second layer 26 from a plurality of nozzles 107 while moving the inkjet head 103 to one side in the Y direction by, for example, an XY moving mechanism. At this time, the ink IA is sprayed onto the position where the first lens portion 21 is to be manufactured.
Ink IB is sprayed onto positions where the plurality of second lens portions 22 are to be manufactured.

As shown in FIG. 6, the Z moving mechanism 101 moves the stage 102 upward. While moving the inkjet head 103 to the other side opposite to the one side in the direction Y by the XY moving mechanism, the roller 108 is brought into contact with the upper surface of the inks IA and IB, and the inks IA and IB are smoothed by the roller 108 . When UV is irradiated from the UV lamp 109, the inks IA and IB are cured. In the third layer 27 on the second layer 26, portions corresponding to the first lens portion 21 and the plurality of second lens portions 22 are manufactured.

Layers

25, 26, 27 are stacked in direction Z. FIG. After layer 27 is formed, stage 102 is lowered to stack the next layer.
One droplet of the ink IA sprayed from the nozzle 107A and curing of the droplet produce the first unit element 21a. The first unit element 21a is made of a first material.
That is, the first unit element 21a is a portion of the first lens portion 21 formed by curing one droplet of the ink IA sprayed from the nozzle 107A.
The second unit element 22a is manufactured by one droplet of the ink IB sprayed from the nozzle 107B and curing of the droplet. The second unit element 22a is made of a second material.
That is, the second unit element 22a is a portion of the second lens portion 22 formed by curing one droplet of the ink IB sprayed from the nozzle 107B.

Although not shown, the first layer 25 and the second layer 26 are composed of at least one of the first unit element 21a and the second unit element 22a.

In FIG. 7, an example of an ideal shape of the second lens portion 22 is indicated by a chain double-dashed line L1.
The first lens portion 21 has a plurality of first unit elements 21a. The multiple first unit elements 21a are integral. The second lens portion 22 has a plurality of second unit elements 22a. The multiple second unit elements 22a are integral.
In order to form the outer surface of the second lens portion 22 smoothly, the size of one second unit element 22a can preferably be made as small as possible. The size of one first unit element 21a is the same as that of the second unit element 22a.
In particular, the plurality of second lens portions 22 are arranged within the first lens portion 21, and the outer surface of each second lens portion 22 cannot be polished after the spectacle lens 20A is manufactured. For this reason as well, the size of one second unit element 22a can preferably be made as small as possible.

Further, it is possible to change the size of droplets of ink IA sprayed from nozzle 107A and droplets of ink IB sprayed from nozzle 107B, and use both droplets to preferably form one first unit element. can. Thereby, the structure indicated by the two-dot chain line L1 can be made more densely. A method of forming one first unit element using both droplets includes a method of unevenly distributing ink IA and ink IB in one first unit element, or a method of mixing ink IA and ink IB. A possible method is to configure one first unit element by using
That is, at least a part of the plurality of first unit elements may be composed of the first material and a third material having a third refractive index different from the first refractive index but smaller than the second refractive index. In this case, the first lens portion (first unit element) is made of the first material and the third material (at least the first material). The second lens portion (at least part of the plurality of second unit elements) may also be made of a material (at least the second material) having a refractive index higher than the first refractive index in addition to the second material. .

In addition, when the shape of the second lens portion 22, the arrangement of the second lens portion 22, and the spectacle lens 20A are viewed in the direction along the optical axis C1, a plurality of lenses arranged per unit area in the first annular region R1 The number of the second lens units 22 (hereinafter referred to as the arrangement density of the second lens units 22) can be set arbitrarily.
With such a configuration, it is possible to increase the degree of freedom in designing the spectacle lens 20A.

In addition, when the type of 3D printer that manufactures the spectacle lens 20A is an inkjet system, the first unit element and the second unit element are defined as follows.
In the xyz orthogonal coordinate system, the three-dimensional shape of each lens portion is equally divided for each xyz axis. For example, the x-axis is divided by the length Δx, the y-axis is divided by the length Δy, and the z-axis is divided by the length Δz to obtain the three-dimensional shape of each lens part. Form.
At that time, the first unit element is an element having a unit length divided for each axis for configuring the first lens portion. That is, the first unit element is an element having a length Δx along the x-axis, a length Δy along the y-axis, and a length Δz along the z-axis.
Similarly, the second unit element is an element having a unit length divided for each axis for configuring the second lens portion.

In the orthogonal coordinate system, the lengths of Δx, Δy, and Δz may not be the same.
The unit elements (the first unit element and the second unit element) may be spherical with a diameter of Δl. In this case, the unit elements may be arranged in parallel, arranged in a cubic lattice, or arranged in a close-packed structure, for example.
If the 3D printer is inkjet, each unit element is formed by curing one droplet of ink.

When the type of 3D printer that manufactures the spectacle lens 20A is the fused lamination method, stereolithography method, or powder sintering method, the first unit element and the second unit element are defined as follows.
In these methods, the spectacle lens 20A is composed of a plurality of layers stacked in a predetermined stacking direction such as the vertical direction. A portion formed of the first material included in each layer is the first unit element. A portion formed of the second material included in each layer is the second unit element.
A first lens portion is configured by having a plurality of first unit elements stacked in the stacking direction. A plurality of first unit elements are integrated to form a first lens portion. Similarly, the second lens portion is configured by having a plurality of second unit elements stacked in the stacking direction. A plurality of second unit elements are integrated to form a second lens portion.

As shown in FIG. 1, the spectacle lens 30 includes a first lens portion 31 and a plurality of second lens portions 32 configured in the same manner as the first lens portion 21 and the plurality of second lens portions 22 of the spectacle lens 20. Prepare. The plurality of second lens portions 32 are arranged in the annular first annular region R2. Although not shown, the spectacle lens 30 before being processed to match the shape of the spectacle frame 10 is hereinafter referred to as a spectacle lens 30A.
A method for manufacturing the spectacle lens 20A configured as described above includes, for example, manufacturing the spectacle lens 20A with the 3D printer 100 (by the layered manufacturing method). The spectacle lens 30A is similar to the spectacle lens 20A.

Next, a procedure for correcting myopia of a patient using the spectacles 1 (spectacle lenses 20A and 30A) will be described.
FIG. 8 shows a cross-sectional view of the eyeball P2 of the patient P1. This patient P1 is myopic and has an elongated eyeball P2. Reference P4 is the crystalline lens of the eyeball P2.
A spectacle lens 20A is arranged on the near side (in front of the patient P1) with respect to the eyeball P2. Parallel light passing through the first lens portion 21, which is a concave meniscus lens, is refracted and propagates.
Parallel light passing through the second lens portion 22, which is a biconvex lens, travels so as to gather at one point.
The light M1 that passes through the first lens unit 21 and does not pass through the second lens unit 22 passes through the crystalline lens P4 and is focused (formed into an image) on the focal plane S1 located on the retina P3 of the eyeball P2. On the other hand, the light M2 that has passed through the first lens unit 21 and the second lens unit 22 is focused on the focal plane S2 located on the front side of the retina P3, except on the optical axis C1. For this reason, it is thought that the retina P3 is brought to the near side in an attempt to focus, thereby suppressing the elongation of the eye axis.

For example, in the first step, the doctor measures the shape of the retina P3 (focal plane S1) of the patient P1 by OCT (Optical Coherence Tomography) or the like.
Next, in the second step, the doctor creates prescriptions for the spectacle lenses 20A and 30A based on the measurement results. Specifically, for example, the following prescription data is determined for the spectacle lens 20A based on the measurement results.
Part of the prescription data is the second refractive index, the shape of the plurality of second lens units 22 , the size of the plurality of second lens units 22 , and the arrangement of the plurality of second lens units 22 . Another part of the prescription data is the arrangement density of the second lens units 22 .
Alternatively, the shape, distribution, and density of the second lens portion 22 can be preferably determined by the lens manufacturer (manufacturer) based on the eye condition of the patient P1 from the OCT data.
At this time, the arrangement density and the like of the second lens unit 22 are set based on the progress speed of the myopia of the patient P1, for example, the temporal change of the eye axis, the difference between the age of the patient P1 and the standard eye axial length, and the like. You may
The spectacle lens 30A is similar to the spectacle lens 20A.

Next, in a third step, the doctor sends OCT data and/or axial length data to the lens manufacturer in addition to the prescription data. A lens manufacturer designs spectacle lenses 20A and 30A based on the prescription data. Using the 3D printer 100, spectacle lenses 20A and 30A are manufactured. The spectacle lenses 20A and 30A are subjected to edging to manufacture the spectacle lenses 20 and 30.例文帳に追加
The

spectacle lenses

20 and 30 are attached to the pair of rims 11 of the spectacle frame 10 to manufacture the spectacles 1. - 特許庁
A patient P1 uses spectacles 1 . When the patient P1 uses the spectacles 1, myopia of the patient P1 is corrected.
A patient P1 regularly sees a doctor. The first to third steps are repeated as appropriate according to the progression of myopia of the patient P1.

As described above, in the spectacle lens 20A of the present embodiment, the parallel light passing through the first lens portion 21, which is a concave lens, is refracted and spreads, and the parallel light passing through the second lens portion 22, which is a convex lens. advances so as to gather more than the light before passing through the second lens portion 22 . The first lens unit 21 makes it easier to focus on the retina P3 of the eyeball P2 whose eye axis has become longer due to myopia. Also, the light M2 that has passed through the first lens portion 21 and the second lens portion 22 is focused on the front side of the light M1 that has passed through the first lens portion 21 and has not passed through the second lens portion 22 . For this reason, it is thought that the retina P3 is brought to the near side in an attempt to focus, thereby suppressing the elongation of the eye axis.
The first lens portion 21 has a plurality of first unit elements 21a, and the plurality of first unit elements 21a are integrated. The second lens portion 22 has a plurality of second unit elements 22a, and the plurality of second unit elements 22a are integrated. Therefore, for example, it is possible to form the first lens portion 21 by spraying the first material and forming the second lens portion 22 by spraying the second material, etc., using an inkjet 3D printer 100 or the like. can.
Further, for example, the spectacle lens 20A in which the prescription data is changed according to the degree of progression of myopia of the patient P1 can be easily manufactured by the 3D printer 100 or the like even if it is custom-made.

At least part of the plurality of first unit elements may be composed of the first material and the third material. In this case, the degree of freedom in designing the first unit element can be increased.
The multiple second lens portions 22 are arranged in the first annular region R1. Therefore, when the position of the spectacle lens 20A around the optical axis C1 with respect to the eyeball P2 changes, it is possible to suppress the change in the image visually recognized by the patient P1.
In general, the image of light passing through the first annular region may appear cloudy depending on whether the light passes through the second lens portion. Therefore, the light passing through the optical axis C1 and passing through the center of the annular first annular region R1 can be visually recognized without clouding the image.

Further, in the method for manufacturing the spectacle lens 20A of the present embodiment, in the spectacle lens 20A, the parallel light that has passed through the first lens portion 21, which is a concave lens, is refracted and spreads, and passes through the second lens portion 22, which is a convex lens. The parallel light that has passed through travels so as to be more concentrated than the light that has not passed through the second lens section 22 . The first lens unit 21 makes it easier to focus on the retina P3 of the eyeball P2 whose eye axis has become longer due to myopia. Also, the light M2 that has passed through the first lens portion 21 and the second lens portion 22 is focused on the front side of the light M1 that has passed through the first lens portion 21 and has not passed through the second lens portion 22 . For this reason, it is thought that the retina P3 is brought to the near side in an attempt to focus, thereby suppressing the elongation of the eye axis.
By manufacturing the spectacle lens 20A with the 3D printer 100, the custom-made spectacle lens 20A in which the shape of the second lens unit 22, its arrangement and density are changed according to the progress of myopia of the patient P1 can be easily manufactured. can be manufactured to

The spectacle lens 20A of the present embodiment can be variously modified in configuration as described below.
Like the spectacle lens 40A of the first modified example shown in FIG. 9, in addition to each configuration of the spectacle lens 20A of the present embodiment, a plurality of fourth lens portions 41 may be provided.
Each of the plurality of fourth lens portions 41 is a biconvex lens (convex lens). Each fourth lens portion 41 is made of a material having a fourth refractive index greater than the first refractive index. The plurality of fourth lens units 41 are arranged inside the first lens unit 21 .
The plurality of fourth lens portions 41 are arranged in an annular second annular region R4 centered on the optical axis C1 when the spectacle lens 40A is viewed in a direction along the optical axis C1.
The second annular region R4 is spaced outward from the first annular region R1 (outside in the radial direction of the first lens portion 21). That is, a gap is formed between the first annular region R1 and the second annular region R4.

The second refractive index and the fourth refractive index may or may not be equal to each other. The shape of the second lens portion 22 and the shape of the fourth lens portion 41 may or may not be equal to each other.
In the following, the number of the plurality of fourth lens portions 41 arranged per unit area in the second annular region R4 when the spectacle lens 40A is viewed in the direction along the optical axis C1 will be referred to as the arrangement of the fourth lens portions 41. called density. The arrangement density of the second lens units 22 and the arrangement density of the fourth lens units 41 may or may not be equal to each other.

The spectacle lens 40A of the first modified example configured as described above can be easily manufactured even if it is made-to-order.
Furthermore, the plurality of fourth lens portions 41 are arranged in the second annular region R4 when the spectacle lens 40A is viewed in the direction along the optical axis C1. Therefore, it is possible to obtain the effect of suppressing myopia progression over a wider range in the visual field of the patient P1. The light that has passed through the gap between the first annular region R1 and the second annular region R4 can be visually recognized without clouding the image of the light.
The second refractive index and the fourth refractive index are equal to each other, and the shape of the second lens portion 22 and the shape of the fourth lens portion 41 may or may not be equal to each other. Furthermore, the arrangement density of the second lens units 22 and the arrangement density of the fourth lens units 41 may or may not be equal to each other. Therefore, the extent to which the progression of myopia of the patient P1 is suppressed by the plurality of second lens units 22 and the extent to which the progression of myopia of the patient P1 is suppressed by the plurality of fourth lens units 41 are made equal over the entire retina P3, Alternatively, it can be varied depending on the range of the retina P3.

Note that the number of fourth lens portions 41 included in the spectacle lens 40A may be one.
In the spectacle lens 40A, the second refractive index and the fourth refractive index may be different from each other. The shape of the second lens portion 22 and the shape of the fourth lens portion 41 may be different from each other. The arrangement density of the second lens units 22 and the arrangement density of the fourth lens units 41 may be different from each other.

Like the spectacle lens 45A of the second modified example shown in FIG. 10, a plurality of fifth lens portions 46 may be provided in addition to each configuration of the spectacle lens 40A of the first modified example.
Each of the plurality of fifth lens portions 46 is a biconvex lens (convex lens). Each fifth lens portion 46 is formed of a material having a fifth refractive index greater than the first refractive index. A plurality of fifth lens units 46 are arranged within the first lens unit 21 .
The plurality of fifth lens portions 46 are arranged in an annular third annular region R6 centered on the optical axis C1 when the spectacle lens 45A is viewed in the direction along the optical axis C1.
The third annular region R6 is arranged in the gap between the first annular region R1 and the second annular region R4.
Below, the number of the plurality of fifth lens portions 46 arranged per unit area in the third annular region R6 when the spectacle lens 45A is viewed in the direction along the optical axis C1 will be referred to as the arrangement of the fifth lens portions 46. called density.

For example, the fifth index is equal to the second index and the fourth index. The shape of the fifth lens portion 46, the shape of the second lens portion 22, and the shape of the fourth lens portion 41 are equal to each other. The arrangement density of the fifth lens sections 46 is smaller than the arrangement density of the second lens sections 22 and the arrangement density of the fourth lens sections 41 .
When viewed by the patient P1, the image formed by the light passing through the third annular region R6 is less likely to be clouded than the images formed by the light passing through the first annular region R1 and the second annular region R4.

The spectacle lens 45A of the second modified example configured as described above can be easily manufactured even if it is made-to-order.
Furthermore, the light that has passed through the third annular region R6 can also suppress myopia progression in the patient. When the arrangement density of the fifth lens section 46 is smaller than the arrangement density of the second lens section 22 and the arrangement density of the fourth lens section 41, the image formed by the light passing through the third annular region R6 is projected onto the first annular region. The image can be visually recognized with less cloudiness than the image formed by the light passing through R1 and the second annular region R4.
Note that the number of the fifth lens portion 46 included in the spectacle lens 45A may be one.
The convex lenses in the fourth lens portion 41 and the fifth lens portion 46 are not limited to biconvex lenses, and may be plano-convex lenses, convex meniscus lenses, or the like.

In the spectacle lens 20A of this embodiment, the second lens portion may be a concave lens.
In this case, the second material forming the second lens portion has a second refractive index that is less than the first refractive index. Since the second refractive index is smaller than the first refractive index, parallel light that has passed through the second lens section, which is a concave lens, travels in a more concentrated manner than light that has not passed through the second lens section.
In the spectacle lens of this modification, the second lens portion (second unit element) is made of a second material having a second refractive index smaller than the first refractive index. That is, the magnitude relationship between the refractive index of the first material forming the first lens portion and the refractive index of the second material forming the second lens portion is opposite to that of the spectacle lens 20A of the present embodiment.
This spectacle lens manufacturing method manufactures this spectacle lens with the 3D printer 100, for example.

The eyeglass lens and the eyeglass lens manufacturing method of the third modified example configured as described above can produce the same effects as the eyeglass lens 20A and the eyeglass lens manufacturing method of the present embodiment.
Note that the second lens portion in this case may also be made of a material having a refractive index smaller than the first refractive index and different from the second refractive index, and the second material.

As described above, one embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and the configuration can be changed, combined, or deleted without departing from the scope of the present invention. etc. are also included.
For example, the plurality of second lens portions 22 may be arranged in portions of the first lens portion 21 other than the first annular region R1. The number of annular regions in which lens portions are arranged may be three or more.
The plurality of second lens units arranged inside the first lens unit may be made of a material having a different refractive index for each second lens unit. A spectacle lens having such a configuration can be realized by a 3D printer.
The spectacle lens may be a contact lens. Spectacle lenses and contact lenses are included in lenses for vision correction.

20, 20A, 30, 30A, 40A,

45A eyeglass lens

21, 31 first lens portion 21a

first unit element

22, 32 second lens portion 22a second unit element 41 fourth lens portion 46 fifth lens portion R1, R2 First annular region R4 Second annular region R6 Third annular region

Claims

a first lens portion which is a concave lens made of at least a first material;
a second lens portion disposed within the first lens portion and being a convex lens made of at least a second material;
with
the first material has a first refractive index;
the second material has a second refractive index greater than the first refractive index;
The first lens portion has a plurality of first unit elements made of at least the first material,
the plurality of first unit elements are integral,
The second lens portion has a plurality of second unit elements made of at least the second material,
The plurality of second unit elements are integral,
spectacle lens.
At least some of the plurality of first unit elements are formed of a third material having a third refractive index different from the first refractive index and smaller than the second refractive index, and the first material. ,
The spectacle lens according to claim 1 .
A plurality of the second lens parts are provided,
When the spectacle lens is viewed in a direction along the optical axis of the first lens part, the plurality of second lens parts are arranged in a first annular region centered on the optical axis,
The spectacle lens according to claim 1 or 2.
A plurality of fourth lens units that are arranged in the first lens unit and are convex lenses formed of a material having a fourth refractive index larger than the first refractive index,
The plurality of fourth lens portions are arranged in a second annular region centered on the optical axis and spaced outward from the first annular region when the spectacle lens is viewed in a direction along the optical axis. has been
The spectacle lens according to claim 3.
A plurality of fifth lens units that are arranged in the first lens unit and are convex lenses made of a material having a fifth refractive index larger than the first refractive index,
When the spectacle lens is viewed in a direction along the optical axis, the plurality of fifth lens portions are centered on the optical axis and arranged between the first annular area and the second annular area. disposed in the annular third annular region;
The spectacle lens according to claim 4.
a first lens portion which is a concave lens made of at least a first material;
a second lens portion disposed within the first lens portion and being a concave lens made of at least a second material;
with
the first material has a first refractive index;
the second material has a second refractive index that is less than the first refractive index;
The first lens portion has a plurality of first unit elements made of at least the first material,
the plurality of first unit elements are integral,
The second lens portion has a plurality of second unit elements made of at least the second material,
The plurality of second unit elements are integral,
spectacle lens.
a first lens portion which is a concave lens made of at least a first material;
a second lens portion disposed within the first lens portion and being a convex lens made of at least a second material;
with
the first material has a first refractive index;
The second material manufactures a spectacle lens having a second refractive index larger than the first refractive index by an additive manufacturing method,
A method for manufacturing a spectacle lens.
a first lens portion which is a concave lens made of at least a first material;
a second lens portion disposed within the first lens portion and being a concave lens made of at least a second material;
with
the first material has a first refractive index;
The second material manufactures a spectacle lens having a second refractive index smaller than the first refractive index by an additive manufacturing method,
A method for manufacturing a spectacle lens.