JP5936055B2 - Method for manufacturing orthodontic contact lenses - Google Patents

Description

The present invention relates to a method of manufacturing a correction contact lens that is used by being directly attached to the cornea.

  As an individual ages, the eye focuses on a relatively close object of the observer (the individual), causing the natural lens to become stiff and less adjustable. Such a condition is known as presbyopia, and typically aged patients have various combinations of presbyopia, astigmatism, myopia, and hyperopia, and in particular correct the vision of patients with presbyopia. This is difficult, and various ways to solve this problem have been suggested over the years.

  One known method includes a distance power and a near power portion having a convex surface and a concave surface on the opposite side, and one of the convex surface and the concave surface is alternately arranged, and one or more distance power portions are cylindrical. There is a lens using a contact lens including an ophthalmic lens having a power (Patent Document 1).

  In this contact lens, the configuration of the ophthalmic lens is complicated and there is a problem that the production cost increases because accuracy is required, and there is a need for a method for improving the visual acuity of a presbyopic person with a simple configuration. Yes.

  There are also multifocal contact lenses having a colored portion in the central region of the lens and a pinhole formed in the central portion of the colored portion (for example, Patent Document 2, Patent Document 3, and Cited Document 4). In such a pinhole lens, thin light that hardly bends enters the crystalline lens and the focal length is extended to increase the depth of focus, so that the retina is focused and the visual acuity is improved without using the ciliary muscle.

Special table 2004-507794 gazette US Pat. No. 3,794,414 Japanese National Publication No. 9-502542 JP 11-242191 A

  In such a pinhole lens, if the inner diameter of the pinhole is too small, the amount of light entering the pupil is insufficient, and if it is too large, the pinhole effect cannot be obtained, and precise dimensional accuracy is required. A precise contour is required.

The present invention has been made in view of the above points, and a correction contact lens capable of forming a transparent aperture portion that is not colored at the center of the lens by a colored portion with precise dimensional accuracy, precise positional accuracy, and a sharp outline. It aims at providing the manufacturing method of.

  In order to solve the above-described problems and achieve the object, the present invention is configured as follows.

  The invention according to claim 1 includes a lens material filling step of filling a mold for molding a contact lens with a lens material, a masking step of positioning a masking material on the filled lens material, and the masking material. A colorant fixing step for fixing the colorant to the lens material around the center, a masking material removal step for removing the masking material, and a cover material provided on the lens material so as to cover the colorant from which the masking material has been removed And a cover step, and forming a transparent aperture portion that is not colored at the center of the lens by the colored portion.

  The invention according to claim 5 is characterized in that a colored transparent member having a diaphragm hole is sandwiched and bonded between a pair of divided contact lenses, and a transparent aperture portion that is not colored at the center of the lens is formed by the colored portion. It is a contact lens.

  With the above configuration, the present invention has the following effects.

In the first aspect of the present invention, the aperture transparent portion that is not colored at the center of the lens by the colored portion can be formed with precise dimensional accuracy, precise positional accuracy, and a clear outline.

It is a figure explaining the manufacturing process of the presbyopia correction contact lens of 1st Embodiment. It is a figure explaining a lens raw material filling process. It is a figure explaining a masking process. It is a figure explaining a coloring agent fixing process. It is a figure explaining a masking material removal process. It is a figure explaining a cover process. It is a figure which shows the presbyopia correction contact lens. It is a figure which shows embodiment of the presbyopia correction contact lens. It is a figure explaining the manufacturing process of the presbyopia correction contact lens of 2nd Embodiment. It is a figure explaining the spin-casting method. It is a figure explaining a molding method. It is a figure explaining the race cut method. It is a figure which shows the presbyopia correction contact lens. It is a figure explaining the manufacturing process of the presbyopia correction contact lens of 3rd Embodiment. It is a figure which shows the presbyopia correction contact lens. It is a figure which shows the presbyopia correction contact lens. It is a figure which shows the state which mounted | wore the surface of the cornea of the eye with the presbyopia correction contact lens. It is a figure explaining focusing by the transparent part of a presbyopia correction contact lens.

Embodiments of the method for manufacturing a presbyopia correcting contact lens of the present invention will be described below. The embodiment of the present invention shows the most preferable mode of the present invention, and the present invention is not limited to this.

(Presbyopia correction contact lens manufacturing method and presbyopia correction contact lens)
[First Embodiment]
A method for manufacturing a presbyopia correcting contact lens according to the first embodiment will be described with reference to FIGS. FIG. 1 is a diagram for explaining a manufacturing process of a presbyopia correction contact lens, FIG. 2 is a diagram for explaining a lens material filling step, FIG. 3 is a diagram for explaining a masking step, and FIG. 4 is a diagram for explaining a colorant fixing step. 5 is a diagram for explaining the masking material removing step, and FIG. 6 is a diagram for explaining the cover step.

  As shown in FIG. 1, the presbyopia correction contact lens of this embodiment is manufactured by a lens material filling step A1, a masking step A2, a colorant fixing step A3, a masking material removing step A4, and a cover step A5. And an annular colored portion 2 is provided on the presbyopia correcting contact lens 1, and a circular aperture transparent portion 3 which is not colored is formed at the center of the lens.

(Lens material filling process A1)
In the lens material filling step A1, as shown in FIG. 2, a lens material 11 is filled into a mold 10 for molding a contact lens. The mold 10 is formed in the shape of a contact lens to be molded, and various known materials can be used as the lens material 11, and MMA (metal methacrylate) of oxygen non-permeable hard contact lens, oxygen permeable SMA (siloxanyl methacrylate) and FMA (fluoromethacrylate) for water-resistant hard contact lenses, HEMA (hydroxyethyl methacrylate), N-VP (N-vinylpyrrolidone), DMAA (dimethylacrylamide), GMA for hydrous soft contact lenses (Glycerol methacrylate), non-hydrous soft contact lens silicone rubber, butyl acrylate, dimethylsiloxane, biocompatible contact lens collagen, amino acid copolymer, and the like.

  In addition, as the polymerizable monomer for contact lenses, generally used radically polymerizable compounds are conceivable, such as compounds containing at least one vinyl group, allyl group, acrylic group, or methacryl group in the molecule. Any material usually used as a hard contact lens or soft contact lens material can be used. Specifically, acrylic esters such as alkyl acrylate, siloxanyl acrylate, fluoroalkyl acrylate, hydroxyalkyl acrylate, polyethylene glycol acrylate, vinyl acrylate, styrene derivatives, N-vinyl lactam, vinyl (polyvalent) carboxylate A vinyl compound such as can be considered. More specifically, for example, styrene, acrylic acid, methyl acrylate, ethyl acrylate, n-butyl acrylate, phenyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, methacrylic acid, methyl methacrylate, ethyl methacrylate, n- Butyl methacrylate, 2-ethylhexyl methacrylate, isobornyl methacrylate, benzyl methacrylate, phenyl methacrylate, 2-methacryloyloxyethyl succinic acid, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 2-hydroxybutyl methacrylate, fumaric acid and their Use esters, methacrylonitrile, N, N-dimethylacrylamide, N-vinyl-2-pyrrolidone, etc. Rukoto is possible.

  Further, as a crosslinking agent, ethylene glycol dimethacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, propylene glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, 1,4-butanediol diacrylate, 1,6- Polyfunctional monomers such as hexanediol diacrylate, glycerin diacrylate, divinylbenzene diallyl phthalate, and diethylene glycol bisallyl carbonate can be used.

  In addition, as the polymer, in particular, a functional group (for example, a hydroxyl group) is included on the polymer chain, a functional group (for example, an imino group) is included in the polymer chain, or a functional group bonded to the polymer skeleton through a crosslinking group. Polymers based on raw polymer containing groups can be used. These starting polymers are in particular polyhydroxyl compounds having a 1,2- and / or 1,3-diol structure, such as polyvinyl alcohol, or hydrolyzed copolymers of vinyl acetate (for example vinyl chloride, N-vinylpyrrolidone). Copolymer).

(Masking process A2)
In the masking step A2, as shown in FIG. 3, the masking material 12 is positioned on the filled lens material 11. The masking material 12 is precisely positioned at the center of the contact lens. The masking material 12 is positioned by dropping it as droplets or by printing, transferring, coating, or the like. The masking material 12 is circular, and for example, the diameter is preferably in the range of 0.8 mm to 1.6 mm, and the tolerance is ± 0,1 mm.

  As the masking material 12, a material that repels a colorant or an ink repellent material can be used, and a silicon compound and a fluorine resin are typical. As this ink repellent substance, for example, JP2011-98341A, JP2012-30488A, JP2012-22337A, JP2011-209443A, JP2010-217910A, JP-A 2010-208286, JP-A 2010-108927, JP-A 2010-33952, JP-A 2009-168948, and JP-A 2009-48200 can be used. Also, ink is used as a colorant, and the preparation of this ink is disclosed in, for example, Japanese Patent Publication No. 2008-508377 and Japanese Patent Publication No. 2007-537492.

(Colorant fixing step A3)
In the colorant fixing step A3, as shown in FIG. 4, the colorant 13 is fixed to the lens material 11 with the masking material 12 as the center. As a method for fixing the colorant 13 to the lens material 11, it is dropped as a droplet or by a method such as printing, transfer or coating. For example, it may be dropped and fixed by heating, UV irradiation, chemical reaction or the like. Good. The diameter of the fixed colorant 13 can be, for example, in the range of 3.8 mm to 5.0 mm, and the tolerance is ± 0,1 mm. Further, as the colorant 13, an anthraquinone colorant, a phthalocyanine colorant, an azo colorant, a triphenodioxane colorant, a violanthrone colorant, a metal oxide colorant, or an inorganic colorant An agent or the like can be used.

(Masking material removal step A4)
In the masking material removal step A4, the masking material 12 is removed as shown in FIG. The masking material 12 can be removed by physical removal by water pressure washing, wind pressure washing or the like, removal by UV irradiation, or removal by chemical treatment.

(Cover process A5)
In the cover process A5, as shown in FIG. 6, a cover material 14 is provided on the lens material 11 so as to cover the colorant 13 from which the masking material 12 has been removed. The cover material 14 is preferably more hydrophilic and biocompatible and smooth than the monomer or polymer of the lens material, and is a polyacrylic acid (PAA) surface composite, or a hydrocarbon or polymer coat, or a polymer A carbon first coat or the like can be used.

  In this manner, the presbyopia correcting contact lens 1 is provided with the annular colored portion 2, and the circular aperture transparent portion 3 that is not colored at the center of the lens by the colored portion 2 having the annular aperture hole is provided with precise dimensional accuracy and precision. It is possible to form with position accuracy and a clear outline.

(Presbyopia correction contact lens)
As shown in FIG. 7, this presbyopia correcting contact lens 1 has a masking material positioned on a lens material 11 filled in a mold for molding a contact lens, and a colorant 13 is placed around the masking material as a lens material. 11 is fixed, a cover material 14 is provided on the lens material 11 so as to cover the colorant 13 by removing the masking material, and a circular aperture transparent portion 3 that is not colored at the center of the lens by the colored portion 2 having an annular aperture hole. It is the formed structure.

  This presbyopia correction contact lens 1 can be formed as shown in FIG. Embodiment 1 (FIG. 8A) is a presbyopia correction contact lens having a circular outer periphery, the center of the colored portion 2 is circular, the outer periphery is hexagonal, and the circular shape is the aperture transparent portion 3. The second embodiment (FIG. 8B) is a presbyopia correction contact lens having a circular outer periphery, the center of the colored portion 2 is circular, the outer periphery is circular, and the circular shape is the aperture transparent portion 3. Embodiment 3 (FIG. 8C) is a presbyopia correction contact lens having a circular outer periphery, and the colored portion 2 has 19 circular shapes, the outer periphery is circular, and the 19 circular shapes are the aperture transparent portion 3. is there. Embodiment 4 (FIG. 8 (d)) is a presbyopia correction contact lens having a circular outer periphery, the center of the colored portion 2 is a star shape, the outer periphery is a 24 square shape, and the star shape is a diaphragm transparent portion 3. is there. Embodiment 5 (FIG. 8E) is a presbyopia correction contact lens having a hexagonal outer periphery, the center of the colored portion 2 is circular, the outer periphery is hexagonal, and the circular shape is the aperture transparent portion 3. The sixth embodiment (FIG. 8F) is a presbyopia correction contact lens having a heart shape on the outer periphery, the center of the colored portion 2 is circular, the outer periphery is circular, and the circle is the aperture transparent portion 3. The shape of the presbyopia correction contact lens and the shape of the colored portion 2 shown in the first to sixth embodiments are examples, and the combination of the shapes is not limited to this.

[Second Embodiment]
A method for manufacturing a presbyopia-correcting contact lens according to the second embodiment will be described with reference to FIGS. FIG. 9 is a diagram for explaining a manufacturing process of a presbyopia correction contact lens, FIG. 10 is a diagram for explaining a spin casting method, FIG. 11 is a diagram for explaining a molding method, and FIG. 12 is a diagram for explaining a race cut method.

  The presbyopia correction contact lens of this embodiment has a lens molding step B1, a colored member molding step B2, and a sandwiching and joining step B3 as shown in FIG. The circular colored transparent portion 3 is formed by the annular colored portion 2 so as not to be colored at the center of the lens.

(Lens molding process B1)
In the lens molding step B1, a pair of split contact lenses is molded. As a method of manufacturing this divided contact lens, a spin casting method (FIG. 10) in which a lens material of a contact lens is injected into a rotating mold and then expanded by centrifugal force is polymerized. There is known a molding method (FIG. 11) or the like in which casting is carried out to form a convex mold. Further, in recent years, there are manufacturing methods in which the front surface is formed by a mold and the rear surface is lace cut, and conversely, there is a lace cut manufacturing method (FIG. 12) in which the rear surface is formed by a mold and the front surface is lace cut. Any method of manufacturing a lens can be employed.

(Coloring member forming step B2)
In the colored member forming step B2, an annular colored member is formed. The coloring member may be an accu-focus ring that adjusts the amount of light that enters the eye with a special lens, making it easy to see near by the pinhole effect, and a thin heat-resistant plastic sheet, metal thin film, and heat-resistant film are formed in an annular shape It may be a thing. As a thin heat-resistant plastic sheet, for example, an acrylic resin, as a metal thin film, for example, a black metal such as manganese or chromium, and as a heat-resistant film, for example, a polyimide film can be used.

(Pinch joining process B3)
In the sandwiching and joining step B3, joining is performed by sandwiching the coloring member between the pair of divided contact lenses. In this joining, a coloring member is sandwiched and pasted between a pair of divided contact lenses.

  In this way, the presbyopia correcting contact lens 1 is provided with the annular colored portion 2, and the circular colored transparent portion 3 that is not colored at the center of the lens by the annular colored portion 2 has a precise dimensional accuracy, a precise positional accuracy, and a sharpness. It is possible to form with a simple contour.

(Presbyopia correction contact lens)
As shown in FIG. 13, the presbyopia-correcting contact lens 1 has a circular coloring member 22 sandwiched between a pair of divided contact lenses 21 and 21, and the circular coloring portion 2 does not color the center of the lens. The aperture transparent portion 3 is formed. The presbyopia correcting contact lens 1 can be configured in the same manner as in the first to sixth embodiments described in the first embodiment.

[Third Embodiment]
A method for manufacturing the presbyopia correcting contact lens of the third embodiment will be described with reference to FIG. FIG. 14 is a diagram for explaining a manufacturing process of a presbyopia correcting contact lens.

  As shown in FIG. 14, the presbyopia correction contact lens of this embodiment has a lens molding step C1, a coloring member molding step C2, and a cover step C3. A portion 2 is provided, and a circular aperture transparent portion 3 that is not colored is formed at the center of the lens.

(Lens molding process C1)
In the lens molding step C1, a contact lens is molded. The contact lens 31 is manufactured in the same manner as in the second embodiment.

(Coloring member forming step C2)
In the colored member forming step C2, the annular colored member 32 is formed in the same manner as in the second embodiment.

(Cover process C3)
In the cover step C <b> 3, an annular colored member 32 is provided on the contact lens 31 and covered with a cover material 33. The cover material 33 is preferably a member that is more hydrophilic, biocompatible and smooth than the monomer or polymer of the lens material, such as a polyacrylic acid (PAA) surface composite, or a hydrocarbon or polymer coat, or a polymer. A carbon first coat or the like is used.

  In this way, the presbyopia correcting contact lens 1 is provided with the annular colored portion 2, and the circular colored transparent portion 3 that is not colored at the center of the lens by the annular colored portion 2 has a precise dimensional accuracy, a precise positional accuracy, and a sharpness. It is possible to form with a simple contour.

(Presbyopia correction contact lens)
As shown in FIG. 15, the presbyopia correction contact lens 1 is provided with an annular coloring member 32 on the contact lens 31, and the coloring member 32 is covered with a cover material 33 so that the center of the lens is not colored by the annular coloring portion 2. The circular aperture transparent portion 2 is formed. The presbyopia correcting contact lens 1 can be configured in the same manner as in the first to sixth embodiments described in the first embodiment.

(Structure of presbyopia correction contact lens)
The presbyopia correcting contact lens will be described with reference to FIG.

  The presbyopia correcting contact lens 1 has a colored portion 2 and a circular aperture transparent portion 3 that is not colored at the center of the colored portion 2 is formed. The colored portion 2 may be provided on the entire surface except for the aperture transparent portion 3, but the aperture transparent portion 3 is preferably circular with a diameter of 0.8 to 1.6 mm. The colored portion 2 of this embodiment is an annular colored portion composed of an outer peripheral edge having a diameter of 8.0 to 10.0 mm and an inner peripheral edge having a diameter of 0.8 to 1.6 mm. Although the coloring part 2 is black, it is not limited to this black, and may be amber, red, brown, etc., and a color with low lightness is preferable.

  The aperture transparent portion 3 is formed in the center of the colored portion 2, and when the presbyopia correction contact lens 1 is mounted on the surface of the cornea of the eye, the amount of light entering the eye is reduced, and the in-focus range is widened and clear. It works to be visible.

  The colored portion 2 has an annular shape constituted by an outer peripheral edge portion having a diameter of 8.0 to 10.0 mm and an inner peripheral edge portion having a diameter of 0.8 mm to 1.6 mm, and has a diameter of 8.0 to 10.0 mm. The outer peripheral edge of the coloring part 2 almost corresponds to the size of the pupil of the eye, and there is no impression of wearing the presbyopia correction contact lens 1 from the outside, and the appearance is good. Moreover, it is preferable that the diameter of the aperture transparent portion 3 is 0.8 mm to 1.6 mm because the amount of light entering the eye can be reduced and the in-focus range can be further expanded.

  The presbyopia correction contact lens 1 can be various combinations of astigmatism, myopia, and hyperopia.

(Presbyopia correction method)
The presbyopia correction method of this invention is demonstrated based on FIG.17 and FIG.18. When presbyopia progresses and reading glasses are used, the presbyopia correcting contact lens 1 is mounted on the surface of the cornea 51 of one eye 50 in which presbyopia has progressed, as shown in FIG. When the presbyopia correcting contact lens 1 is thus mounted, focusing can be performed through the aperture transparent portion 3 formed by the inner peripheral edge portion of the colored portion 2 having a diameter of 0.8 mm to 1.6 mm.

  Accordingly, as shown in FIG. 18 (a), the presbyopia correction contact lens 1 is attached to the surface of the cornea 51 of one eye 50 in which presbyopia has advanced, so that the focal point passes through the aperture transparent portion 3 of the presbyopia correction contact lens 1. The amount of light entering the eye 50 is reduced by the aperture transparent portion 3, and the in-focus range is widened and becomes clear.

  On the other hand, in the state where the presbyopia correcting contact lens 1 is not worn, as shown in FIG. 18 (b), the amount of light entering the eye 50 is large and blurry or blurred.

  The presbyopia correction method using the presbyopia correction contact lens 1 is used for correcting one of the presbyopia, so that the balance with both eyes is achieved and the appearance is not uncomfortable.

  The present invention can be applied to a manufacturing method of a correction contact lens that is used by directly attaching to the cornea, and the aperture transparent portion that is not colored at the center of the lens by the colored portion is provided with precise dimensional accuracy, precise positional accuracy, and clearness. It is possible to form with a contour.

DESCRIPTION OF SYMBOLS 1 Correction contact lens 2 Coloring part 3 Diaphragm transparent part A1 Lens raw material filling process A2 Masking process A3 Colorant fixing process A4 Masking material removal process A5 Cover process B1 Lens molding process B2 Coloring member molding process B3 Joining process C1 Lens molding process C2 Coloring Member forming process C3 Cover process

Claims (1)

A lens material filling process for filling a lens material into a mold for molding a contact lens;
A masking step of positioning a masking material on the filled lens material;
A colorant fixing step of fixing the colorant to the lens material around the masking material;
A masking material removing step of removing the masking material;
A cover step of providing a cover material on the lens material so as to cover the colorant from which the masking material has been removed,
A method for producing a presbyopia-correcting contact lens, wherein a transparent aperture portion that is not colored at the center of the lens is formed by the colored portion.