JP6448104B1 - Pinhole contact lens and method for manufacturing pinhole contact lens - Google Patents

Abstract

Provided are a pinhole contact lens and a method for manufacturing the pinhole contact lens, which can reduce a ring-shaped shadow appearing in the field of view without deteriorating the quality of appearance due to the pinhole effect.
A contact lens 100 that is used by being worn on a human cornea, wherein a body 10 of the contact lens 100 is disposed at the center of the cornea, and is disposed at the center of the body 10 to form a pinhole image on the retina. A hole portion 12, a light shielding portion 11 that is provided outside the pinhole portion 12 and shields incident light incident from outside the eye, and a transparent region 13 that is provided outside the light shielding portion 11 and transmits the incident light. Have The light-shielding part 11 colors the outer eye side 11a in black or dark color, and colors the cornea side in light or white color having a higher reflectance than the outer eye side 11a colored in black or dark color.

Description

  The present invention relates to a pinhole contact lens that enables correction of visual acuity of myopia, hyperopia, astigmatism, presbyopia, and a combination thereof by using the depth of focus obtained by the pinhole effect, and in particular, to reduce the quality of appearance. In particular, the present invention relates to a pinhole contact lens and a method for manufacturing the pinhole contact lens, which can reduce a ring-like shadow by a light blocking portion that blocks light and constitutes a pinhole.

Soft contact lenses that are directly attached to the cornea are already widely used as vision correction tools, and as a manufacturing method there is a race-cut method in which dry materials are cut with a lathe, etc., and liquid materials are rotated in a concave container (shaft tool). It has been manufactured by a spin casting method, a metal mold and an injection molding (injection molding) method in which it is crosslinked by heat. In recent years, it has become possible to manufacture in a short time from injection molding that is crosslinked by heat, by molding using a transparent or translucent resin mold and ultraviolet crosslinking, and disposable soft contact lenses (disposable contact lenses) have become the mainstream.
In addition to conventional myopia and hyperopia correction (spherical power correction), cylindrical power correction (astigmatism power correction) toric lens, perspective or far-medium near-focus correction multifocal contact lens, strong cosmetic contact color contact lens, etc. Some contact lenses have added value.

On the other hand, the pinhole effect has been known for a long time, and research has been conducted on the relationship between the distance to the subject, the size of the hole, and the depth of focus in order to maximize the pinhole effect. It has been put into practical use as a camera. Although there are drawbacks such as resolution and darkness of the image, the greatest advantage of the pinhole effect is that the subject can be projected on the screen etc. in a focused state without using the lens power because the focal depth is used. .
Applying the pinhole principle, which utilizes the fact that light passing through a small pinhole (needle hole) projects an image on a screen, etc., using the depth of focus obtained by the pinhole effect, the light shielding member and its central part There already exists an instrument that directly embeds (fits) an annular mask (annular light-shielding portion) composed of provided pinholes into the cornea by surgery.

  For example, in “CORNEAL INLAY WITH NUTRIENT TRANSPORT STRUCTURES” disclosed in Patent Document 1, a corneal inlay and mask, and a method for improving a patient's visual acuity using the corneal inlay and mask Has been proposed, and a mask with an aperture (aperture) increases the depth of focus of the patient's eyes and improves visual acuity. For example, the mask comprises a central portion having a relatively high visible light transmittance, for example, an annular portion surrounding a transparent lens or aperture that has a relatively low visible light transmittance. This is an annular mask having a small aperture that allows light to pass through the retina so as to increase the depth of focus, and can be used for contact lenses. This technology has already been commercialized, and the diameter of the annular mask is about 4.0 mm. This has a problem that when an annular mask is worn, the amount of light incident on the eye is reduced and the field of view becomes dark. In particular, this lack of light quantity is a problem that is noticeable in dark places and under dark conditions. In order to solve the shortage of light quantity, thousands of holes are provided in the annular mask so that visible light can be passed along with nutrient transport so as to compensate for the shortage of light quantity due to the annular mask.

  Furthermore, a technique combining these has been developed. For example, Patent Document 2 discloses a technique in which an inner annular mask portion (annular light shielding portion) and an outer annular mask portion are provided. It uses the characteristics of the pupil that reacts to brightness, and uses an inner annular mask with high light shielding (low light transmission) in bright places, and the pupils become mydriatic in dark and dark conditions. (The pupil becomes larger), so it is designed to secure light while maintaining the pinhole effect by taking light energy into the eye from the outer annular mask part with low light shielding rate (high light transmittance) ing.

In Patent Document 3, a small hole is provided in the annular mask portion (annular light shielding portion) to promote the incidence of light into the eye, thereby securing the light amount and solving the light amount shortage.
FIG. 30 shows four examples of a plan view of a conventional pinhole contact lens. Among these, the upper two examples in FIG. 30 are examples of contact lenses in which a plurality of holes and slits are provided in the annular light shielding portion in order to solve the problem of insufficient light quantity.
In addition, Patent Documents 4 to 18 show contact lenses according to conventional examples.

International Publication No. 2011/020074 International Publication No. 1995/008135 US Patent No. 8308292 US Pat. No. 5980040 International Publication No. 2007/057734 US Pat. No. 5,757,458 specification International Publication No. 2000/052516 US Patent Application Publication No. 2005/0134793 US Patent Application Publication No. 2006/0265058 British Patent Application No. 2458495 International Publication No. 2007/057734 International Publication No. 1997/048004 International Publication No. 1999/000694 JP 2013-109102 A U.S. Pat.No. 9427311 Japanese Unexamined Patent Publication No. 03-1857 U.S. Pat.No. 5,245,367 US Patent No. 5905561

  It is already known that there is an optimum pinhole diameter and shape for obtaining the pinhole effect when it is applied to a device that embeds an annular mask using the pinhole effect in a cornea or a contact lens that provides the pinhole effect. .

  The pinhole shape is preferably a perfect circle because aberrations occur in shapes other than a circle, and the visible light transmittance of the light shielding part is 0% because only light from the pinhole is projected onto the screen. Is also known to be desirable. Combining this with a contact lens makes it easy to conceive of a pinhole contact lens, but there is a limit to the resolution due to the pinhole effect as with a pinhole camera. In order to maximize the pinhole effect in contact lenses using the pinhole effect, or to obtain the ideal resolution, the visible light transmittance of the annular light shield is 0%, and its diameter is larger than the pupil diameter. A larger one is desirable. However, any of the above-described conventional techniques tends to reduce the diameter of the annular light shielding portion in order to solve the shortage of light amount. In particular, when the annular light shielding portion is smaller than the pupil diameter, extraneous light enters the central retinal fovea in the eye from the periphery (outside) of the annular light shielding portion, so that it is difficult to obtain the original function as the pinhole effect.

  Further, when the principle of the pinhole is used for the contact lens, the highest quality visual acuity can be obtained by taking only the light incident from the pinhole formed at the center of the contact lens into the fovea of the retina. However, as in the prior art, when a plurality of holes are provided in the annular light shielding portion in order to solve the problem of insufficient light quantity, light other than light incident from the pinhole formed at the center of the contact lens, that is, Light incident from a plurality of holes provided in the annular light shielding part is incident on the central retinal fossa, and the quality of appearance is degraded, resulting in a blurred image. In other words, when solving the shortage of light quantity by providing a plurality of holes in the annular light shielding part or making the annular light shielding part semi-transparent, the conditions and the light quantity for maximizing the pinhole effect in the pinhole contact lens Since the conditions for solving the deficiency problem are contradictory, the quality of vision correction and visibility, which is the original purpose of a contact lens, is deteriorated, and the pinhole effect cannot be maximized.

  Furthermore, in the prior art, when a contact lens having a pinhole formed by an annular light shielding portion is worn on the cornea, the amount of light incident on the eye is reduced, so that the wearer not only feels dark, but the view field also uses the annular light shielding portion. The problem that a ring-shaped shadow (shadow) always appears cannot be solved. A ring-shaped shadow is in the field of view when wearing a contact lens in the state of a plastic eyeglass frame (frame). The lower the visible light transmittance of the annular light shielding part (the higher the light shielding property), the more the annular light shielding part. The larger the width (the distance between the inner diameter and the outer diameter), the clearer the appearance, the more uncomfortable, especially in a bright environment.

  An object of the present invention is to provide a pinhole contact lens and a method for manufacturing the pinhole contact lens that can reduce a ring-shaped shadow appearing in the field of view without deteriorating the quality of appearance due to the pinhole effect. It is in.

The pinhole contact lens of the present invention is a contact lens that is used by being worn on a human cornea, and the main body of the contact lens is disposed in the center of the cornea, and the pinhole image is disposed on the center of the main body so as to form a pinhole image on the retina. A pinhole portion that forms an image, a light shielding portion that is provided outside the pinhole portion and shields incident light incident from outside the eye, and a transparent region that is provided outside the light shielding portion and transmits the incident light in pinhole contact lens having the light shielding unit, and characterized in that coloring Mesotogawa colored black or dark, the high Ishiro color reflectance than the eye outer colored corneal side black or dark To do.

The inner diameter of the colored portion of the cornea side colored in white color, may be configured to be larger than the inner diameter of the colored portion of the eye outer colored in black or dark.

The outer diameter of the colored portion of the cornea side colored in white color, may be configured to be smaller than the outer diameter of the colored portion of the eye outer colored in black or dark.

  You may comprise so that the light-shielding rate of the outer edge area | region of the said eye outer side of the said light-shielding part may become a light shielding rate lower than the light-shielding rate of the area | region except the said outer edge area | region of the said eye outer side of the said light-shielding part.

The method of manufacturing a pinhole contact lens according to the present invention is a contact lens that is used by being worn on a human cornea, and is disposed almost at the center of the main body of the contact lens and forms a pinhole image on the retina. A pinhole contact having a hole portion, a light shielding portion provided outside the pinhole portion and shielding incident light incident from outside the eye, and a transparent region provided outside the light shielding portion and allowing the incident light to pass therethrough A method for producing a lens, wherein a black or dark colorant is annularly colored on a part of a concave molding surface or a part of a concave semi-finished product having a thickness smaller than that of a contact lens as a finished product. a coloring step, superimposed on the black or dark-colored colorant are colored the concave mold or in the concave semi the product, annular high Ishiro color of the colorant reflectance than the black or dark-colored colorant In And having a second coloration process of color, the.

In the second coloring step, the inner diameter of the annular colored portion is colored white color may be colored so as to be larger than the inner diameter of the annular colored portion which is colored in black or dark.

In the second coloring step, the outer diameter of the annular colored portion is colored white color may be colored so as to be smaller than the outer diameter of the annular colored portion which is colored in black or dark.

  According to the pinhole contact lens of the present invention, it is possible to reduce the ring-shaped shadow appearing in the field of view without deteriorating the quality of the pinhole effect. Any of myopia, hyperopia, astigmatism, presbyopia, and combinations thereof can be corrected using the depth of focus by the pinhole portion.

  According to the method for manufacturing a pinhole contact lens of the present invention, it is possible to manufacture a pinhole contact lens that can reduce the ring-shaped shadow appearing in the field of view without deteriorating the quality of the pinhole effect. A pinhole contact lens that can correct any of myopia, hyperopia, astigmatism, presbyopia, and a combination thereof can be manufactured using the depth of focus by the pinhole portion.

It is a top view of the pinhole contact lens by this embodiment. It is a bottom view of the pinhole contact lens by this embodiment. FIG. 3 is a cross-sectional view of the pinhole contact lens shown in FIG. 2 taken along the line AA. It is explanatory drawing regarding the incident light which injects into eyes, Comprising: It is explanatory drawing in case the outer diameter D3 is an optimal size. It is explanatory drawing regarding the incident light which injects into eyes, Comprising: It is explanatory drawing in case the outer diameter D3 is too small. It is a bottom view of a pinhole contact lens when inner diameter D2 = inner diameter D4. It is a bottom view of a pinhole contact lens in case of outer diameter D3 = outer diameter D5. It is a bottom view of a pinhole contact lens when inner diameter D2 = inner diameter D4 and outer diameter D3 = outer diameter D5. It is explanatory drawing of the optimality of a pinhole diameter. It is explanatory drawing which shows the state which mounted | wore the cornea with the pinhole contact lens by a prior art example. It is explanatory drawing which shows the state of a visual field at the time of mounting | wearing the cornea with the pinhole contact lens by a prior art example. It is explanatory drawing of the cone cell and the rod cell in a retina. It is explanatory drawing of the manufacturing method of the pinhole contact lens of this embodiment. It is a top view of the pinhole contact lens by another example. It is an enlarged view of the principal part B enclosed with the broken-line part of the pinhole contact lens shown in FIG. It is a bottom view of the pinhole contact lens by another example. It is a top view of the pinhole contact lens by another example. It is an enlarged view of the principal part B surrounded by the broken line part of the pinhole contact lens shown in FIG. It is a top view of the pinhole contact lens by another example. It is a top view of the pinhole contact lens by another example. It is a top view of the pinhole contact lens by another example. It is a top view of the pinhole contact lens by another example. It is a top view of the pinhole contact lens by another example. It is a top view of the pinhole contact lens by another example. It is a top view of the pinhole contact lens by another example. It is a top view of the pinhole contact lens by another example. It is a top view of the pinhole contact lens by another example. It is a top view of the pinhole contact lens by another example. It is a top view of the pinhole contact lens by another example. It is four examples of the top view of the pinhole contact lens by a prior art example.

  DESCRIPTION OF EMBODIMENTS Embodiments of a pinhole contact lens and a pinhole contact lens manufacturing method according to the present invention will be described with reference to the drawings. However, the embodiment described below is merely an example, and there is no intention to exclude various modifications and technical applications that are not explicitly described below. That is, the present invention can be implemented with various modifications (combining the embodiments, etc.) as long as the effects are exhibited. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. The drawings are schematic and do not necessarily match actual dimensions and ratios. In some cases, the dimensional relationships and ratios may be different between the drawings.

1 is a plan view of the pinhole contact lens according to the present embodiment, FIG. 2 is a bottom view of the pinhole contact lens according to the present embodiment, and FIG. 3 is a cross-sectional view of the pinhole contact lens shown in FIG. is there.
As shown in FIGS. 1 to 3, the pinhole contact lens 100 is a contact lens that is used by being worn on a human cornea, and the main body 10 of the pinhole contact lens is disposed at the center of the cornea 30. A pinhole part 12 that forms a pinhole image on the retina, a light shielding part 11 that is provided outside the pinhole part 12 and shields incident light incident from outside the eye, and a light shielding part 11 This is a pinhole contact lens having a transparent region 13 that is provided on the outer periphery of the lens and allows incident light to pass therethrough. The light shielding part 11 colors the outer eye side 11a in black or dark color, and colors the cornea side 11b in light color or white color having a higher reflectance than the outer eye side 11a colored in black or dark color.
In FIG. 1, the outer side 11 a of the light shielding unit 11 is illustrated with horizontal stripes in order to clearly indicate the dimension line and the code lead line. In other figures except FIG. 1, the eye outer side 11a of the light shielding part 11 is illustrated in black.

FIG. 4 is an explanatory diagram regarding incident light that enters the eye, and shows a state in which the pinhole contact lens of the present embodiment is attached to the cornea.
The body 10 of the pinhole contact lens 100 is a circular member in plan view having a curved surface (curvature) along the surface shape of the cornea 30 and is made of a light transmitting material that transmits incident light. As a material, for example, hydroxyethyl methacrylate (HEMA), N-vinyl pyrrolidone (N-VP), dimethylacrylamide (DMAA), glycerol methacrylate (GMA) is formed by irradiating and curing light by a production method described later. ), Silicon hydrogel (SH) and the like are preferably used. Further, as the material of the main body 10, silicon rubber, butyl acrylate, and dimethylsiloxane lenses used for non-hydrous soft contact lenses, hydrous soft contact lenses and the like are also preferably used. In addition, as long as light can be transmitted, a colored material such as blue or red may be used instead of being transparent.

The body 10 of the pinhole contact lens 100 is not limited to a soft contact lens, and may be composed of a hard contact lens. For example, as a material, a siloxanyl methacrylate (SMA) -based so-called oxygen-permeable hard contact lens that transmits oxygen somewhat or an oxygen-impermeable methyl methacrylate (MMA) hard contact lens is used. Silicone hydrogel lenses and hybrid contact lenses that combine the merits of both soft contact lenses and hard contact lenses may be used.
The pinhole contact lens 100 is also used as an exchangeable or disposable soft contact lens.

  The diameter D1 of the main body 10 of the pinhole contact lens 100 is preferably larger than the diameter D3 of the light shielding portion 11 and at least larger than the diameter of the cornea 30 (for example, 12 mm). For example, it is selected to be about 14 mm.

  The pinhole portion 12 is disposed at the approximate center of the main body 10 of the pinhole contact lens 100 and is located at a location including the optical axis connecting the center of the cornea 30 and the fovea 32 of the retina 31. Note that the approximate center of the main body 10 of the pinhole contact lens 100 includes the central portion of the main body 10 and the periphery of the central portion. Note that the approximate center of the main body 10 of the contact lens 100 is also the approximate center of the light shielding portion 11. When mounted on the cornea 30, incident light incident on the cornea 30 is limited by the light-shielding portion 11 provided on the outer periphery of the pinhole portion 12, and the central axis 32 of the wearer 32 is obtained by the light La passing through the pinhole portion 12. A pinhole image is formed on the top.

  The light shielding unit 11 is formed in a circular shape in plan view having a curved surface (curvature) that follows the surface shape of the cornea 30 and shields light incident from outside the eye. As for the light-shielding part 11, the convex side of a lens, ie, the eye outer side 11a, is colored black or dark color (refer FIG. 1, FIG. 3). On the other hand, the concave side of the lens, that is, the cornea side 11b in contact with the cornea 30 is colored light or white (see FIGS. 2 and 3). The corneal side 11b may be a light color or white color having a higher reflectance than the outer side eye 11a colored black or dark.

The outer diameter D3 of the colored portion on the outer side of the eye 11a of the light shielding unit 11 is designed in consideration of the pupil diameter at the time of mydriasis (the size of the pupil in a dark place) that changes according to age.
FIG. 5 is an explanatory diagram relating to incident light that enters the eye, and is an example in which the outer diameter D3 of the colored portion of the light-outside 11a of the light-shielding portion 11 is too small. As shown in the figure, when the outer diameter D3 of the colored portion of the outer side 11a of the light shielding part 11 is too small, the area of the transparent region 13 that transmits the light Lb around the light shielding part 11 increases. Then, the peripheral visual field becomes wide, but light Lb other than the light La incident from the outside of the eye enters the central fovea 32 of the retina 31. This causes a halo phenomenon and glare. In particular, when the pupil diameter is larger than that of the light-shielding portion 11 at night or the like, the light Lb from the transparent region 13 is liable to enter the fovea 32, and the quality of appearance is significantly deteriorated.

  On the other hand, when the outer diameter D3 of the colored portion of the outer side 11a of the light shielding part 11 is too large, the area of the transparent region 13 around the light shielding part 11 becomes small, and the peripheral visual field cannot be secured. This is because a visual field equivalent to that of the naked eye cannot be secured.

  The outer diameter D3 of the colored portion of the outer eye 11a of the light shielding portion 11 of the pinhole contact lens 100 according to the present embodiment is selected, for example, in the range of 4.0 mm to 9.0 mm, and in particular, the diameter is not less than the pupil diameter. Is preferred. Specifically, it is preferable to select a range of 5.5 mm to 6.0 mm.

  The inner diameter D4 of the colored portion on the corneal side 11b of the light shielding portion 11 is preferably larger than the inner diameter D2 of the colored portion on the outer side of the eye 11a. Further, the outer diameter D5 of the colored portion on the cornea side 11b of the light shielding portion 11 is preferably smaller than the outer diameter D3 of the colored portion on the outer side of the eye 11a. This is to prevent the color of the cornea side 11b colored bright or white from being visible from the outside of the eye.

  If the bright color or white color on the corneal side 11b cannot be seen from the outside of the eye, or if the bright color or white color on the corneal side 11b is visible, the outer side of the eye 11a The inner diameter D2 of the colored portion and the inner diameter D4 of the colored portion on the corneal side 11b may be equal (FIG. 6: D4 = D2), or the outer diameter D3 of the colored portion on the outer side of the eye 11a and the outer colored portion on the corneal side 11b. The diameters D5 may be equal (FIG. 7: D5 = D3) or both (FIG. 8: D4 = D2, D5 = D3).

  As the pigment of the light-shielding part 11, materials that have already been established for safety and are used in actual soft contact lenses with iris are preferably used. For example, an azo colorant (red) or a phthalocyanine colorant (blue) can be used. In addition, for the black or dark color of the eye outer side 11a, an eco-friendly carbon pigment or a smoky ink may be used. In addition, conventionally known pigments can be used.

  The position of the light shielding portion 11 in the thickness direction of the pinhole contact lens 100 may be arranged on the convex side of the body 10 of the pinhole contact lens 100, that is, on the outside of the eye when worn, as shown in the cross-sectional view of FIG. preferable. When the light shielding part 11 is disposed on the concave side (corneal side) of the main body 10 of the pinhole contact lens 100, friction is increased due to the unevenness of the colored part by the light shielding part 11 made of a material different from that of the main body 10 of the pinhole contact lens 100. Become. This is because it tends to adhere to the cornea 30 and may cause problems in terms of safety.

  The light shielding part 11 may be configured so as not to be exposed by being sandwiched between the concave side and the convex side by the body material of the pinhole contact lens 100. By disposing the light shielding part 11 at substantially the center in the thickness direction of the main body 10 of the pinhole contact lens 100, the light shielding part 11 can be structured not to be exposed to the outside. Thereby, not only can the pinhole contact lens 100 be prevented from adhering to the cornea 30, but also excessive friction can be prevented from occurring on the front surface portion and the rear surface portion of the pinhole contact lens 100. Therefore, it can prevent that the unevenness | corrugation of the coloring part surface contacts with a lid conjunctiva (back side of a eyelid). During blinking, it is possible to prevent the lens body from moving greatly due to friction between the eyelid conjunctiva and the colored portion, and to prevent the center axis of the lens from deviating from the corneal center (optical axis), thereby ensuring stable visual acuity.

  Next, the optimality of the diameter of the pinhole part 12 (pinhole diameter) will be described. An inner diameter D2 of a colored portion of the outer side 11a of the light shielding portion 11 corresponds to a pinhole diameter. It is already known that there is an optimum pinhole diameter and shape for obtaining the pinhole effect, and the hole shape of the pinhole portion 12 is a perfect circle or a perfect circle in order to prevent aberration due to diffraction of incident light. It is desirable that

  FIG. 9 is an explanatory view of the optimality of the pinhole diameter. As shown in CASE 1 in FIG. 9, if the pinhole diameter is large, the amount of information from the subject is too large, resulting in a blurred image. As shown in CASE 3, if the pinhole diameter is too small, the amount of information is small and the image becomes thin and the contrast is lowered. As shown in CASE 2, an image having a clear contrast can be obtained with an optimal pinhole diameter.

  For the optimal pinhole diameter in far vision, b = r ^ 2 / λ (“r” is the radius of the pinhole, “λ” is the wavelength of light, “b” is the focal length), and near vision For the optimum hole size, calculate the optimum hole size using the formula c = ub / (ub) (where “c” is the focal length and “u” is the distance from the pinhole to the subject). can do. Specifically, the center pinhole diameter can be easily calculated by applying these numerical values to the distance from the anterior cornea (corneal apex) to the fundus (axis length), for example, the pinhole diameter is 1.0 mm to The range is 1.8 mm.

FIG. 10 is an explanatory diagram showing a state where a pinhole contact lens according to a conventional example is mounted on the cornea, and FIG. 11 is an explanatory diagram showing a state of field of view when the pinhole contact lens according to the conventional example is mounted on the cornea. 12 is an explanatory diagram of cone cells and rod cells in the retina.
According to the pinhole contact lens 200 according to the conventional example, the pinhole effect is easily obtained by the light shielding by the light shielding portion. On the other hand, a ring-shaped shadow 33 appears in the field of view due to the light shielding portion.

  FIG. 12 schematically shows the retina. In human eyes, there are cone cells (indicated by gray circles in FIG. 12) that distinguish shapes, and rod cells (indicated by black circles in FIG. 12) that are sensitive to light. To do. The pyramidal cells are present at the highest density in the central pit having a diameter of about 0.2 mm further in the center of the central fovea 32 of the retina 31 having a diameter of about 1.0 mm in the depression of the retina 31 farthest from the cornea 30. On the other hand, since the rod cells exist around the retina 31 except for the fovea 32, how much light is incident on a place other than the fovea 32 by providing a plurality of holes other than the pinhole part in the light shielding part. However, the visual quality is simply degraded, and there is no effect on the recovery of vision.

On the other hand, according to the pinhole contact lens 100 according to the present embodiment, since a plurality of holes are not provided in the light shielding part 11, the quality of appearance is not deteriorated.
Then, although the coloring of the eyes outside 11a of the light blocking portion 11 to the black or dark, and wearing color with high reflectivity bright or white than the eye outside 11a of the corneal side 11b were colored black or dark light-shielding portion 11 . Accordingly, it is possible to reduce the ring-shaped shadow 33 appearing in the field of view without completely blocking the light incident on the eye from the light shielding unit 11 and degrading the quality of the pinhole effect.

  According to the pinhole contact lens 100 of the present embodiment, any of myopia, hyperopia, astigmatism, presbyopia, and combinations thereof can be corrected using the depth of focus by the pinhole portion 12. You may add the frequency | count according to the state of a user's visual acuity.

FIG. 13 is an explanatory diagram of a method for manufacturing the pinhole contact lens of the present embodiment.
First, a black or dark colorant (pigment or the like) 22 is annularly colored on a part of the molding surface of the concave mold 23. Specifically, a black or dark colorant 22 that becomes the outer eye side 11a of the light shielding part 11 is put in a plate 21 obtained by etching (etching) the design of the light shielding part 11 in metal or resin (FIG. 13A). Then, the image is transferred to a transfer body 20 made of curved silicon rubber. Next, the black or dark colorant 22 is circularly printed (colored) on a part of the molding surface of the concave mold 23 by the transfer body 20 colored with the black or dark colorant 22 (first coloring step). (FIG. 13B).

  Next, the light or white colorant 26 having a higher reflectance than the black or dark colorant 22 is annularly colored on the black or dark colorant 22 colored in the concave mold 23. Specifically, a bright or white colorant 26 that becomes the cornea side 11b of the light-shielding portion 11 is placed in a plate 25 different from the plate 21, and transferred to a transfer body 24 made of curved silicon rubber or the like (FIG. 13). (C)). Then, the bright or white colorant 26 that becomes the corneal side 11b of the light shielding portion 11 is printed (colored) on the black or dark colorant 22 that has been printed (colored) in advance (second coloring step). (FIG. 13D).

  In this second coloring step, the inner diameter (D4 in FIG. 2) of the annular colored portion colored light or white is colored to be larger than the inner diameter (D2 in FIG. 1) of the annular colored portion colored black or dark. It is preferable to do. Further, the outer diameter (D5 in FIG. 2) of the annular colored portion colored light or white may be colored to be smaller than the outer diameter (D3 in FIG. 1) of the annular colored portion colored black or dark. preferable.

  Next, a polymerizable composition (hereinafter referred to as a monomer) 27 containing a polymerization initiator, which is a material for forming a pinhole contact lens, is injected into the concave mold 23. Then, after the concave mold 23 is clamped by a pair of convex molds 28, the monomer 27 is polymerized and cured by irradiating light such as ultraviolet rays (FIG. 13E). After curing, the concave mold 23 and the convex mold 28 are removed, and the pinhole contact lens 100 is taken out (FIG. 13F). The annular colored portion colored by the colorant 22 and the colorant 26 becomes the light shielding portion 11 of the pinhole contact lens 100, and the annular central portion (the portion without the colorant) becomes the pinhole portion 12.

  The pinhole contact lens 100 of this embodiment can be manufactured by the manufacturing method described above. The concave mold 23 and the convex mold 28 are not particularly limited as long as they are materials that transmit a necessary dose of light when the polymerizable composition is photopolymerized by irradiating the polymerizable composition with light. Not. Suitable mold materials include, for example, polyolefins such as polyethylene and polypropylene, copolymers thereof, polystyrene, polyacetal, polyacryl ether, polyaryl ether sulfone, nylon-6, nylon-66, nylon-11 and the like. The present invention is not limited to such examples.

  Further, the light-shielding portion 11 may be disposed substantially at the center of the pinhole contact lens 100 in the thickness direction of the main body 10. In this case (when the light-shielding portion 11 is not exposed), a semi-finished product having a thickness smaller than that of the finished pinhole contact lens 100 is prepared in advance, and the colorant 22 and the colorant 26 are annularly printed on the semi-finished product. (Coloring) may be used.

  Specifically, an amount of monomer 27 smaller than the amount injected in FIG. 13E is injected into the concave mold 23, clamped with the convex mold 28, cured, and then from the pinhole contact lens 100 as a finished product. Create a thin semi-finished product with a thin thickness. Then, the colorant 22 is printed (colored) in a ring shape on a part of the concave semi-finished product by the transfer body 20 in which the black or dark colorant 22 is colored (FIG. 13B). The processes after FIG. 13C are the same as those described above, and thus description thereof is omitted.

Through the above steps, the pinhole contact lens 100 in which the light shielding portion 11 is confined can be manufactured.
The method for manufacturing the pinhole contact lens 100 described with reference to FIG. 13 is an example. The manufacturing method of the pinhole contact lens 100 is not limited to the process mentioned above.

  In order to further reduce the ring-shaped shadow 33 that appears in the field of view by the light-shielding part 11 constituting the pinhole part 12 in order to shield the light, in addition to the above-described configuration, You may comprise so that the light-shielding rate of outer edge area | region S1 may become a light-shielding rate lower than the light-shielding rate of the eye outer side 11a of the light-shielding part 11. FIG. Specifically, the light shielding rate of the outer edge region S1 on the outer side of the eye 11a of the light shielding unit 11 may be configured to be lower than the light shielding rate of the region S2 excluding the outer edge region S1.

FIG. 14 is a plan view of a pinhole contact lens according to another example, FIG. 15 is an enlarged view of a main part B surrounded by a broken line part of the pinhole contact lens shown in FIG. 14, and FIG. It is a bottom view of the pinhole contact lens by another example.
In the example shown in FIGS. 14 to 16, the outer edge region S1 of the outer eye side 11a of the light shielding unit 11 is configured by light-shielding portions that shield light from being scattered in spots. Thereby, the light shielding rate of the outer edge region S1 is lower than the light shielding rate of the portion other than the outer edge region S1, that is, the region S2 excluding the outer edge region S1. According to such a configuration, it is possible to further reduce the ring-shaped shadow 33 appearing in the field of view.

  The configuration shown in FIGS. 17 and 18 may be used. FIG. 16 is a plan view of a pinhole contact lens according to another example, and FIG. 18 is an enlarged view of a main part B surrounded by a broken line portion of the pinhole contact lens shown in FIG. The light shielding rate of the outer edge region S1 on the outer side 11a of the light shielding unit 11 may be lower than the light shielding rate of the region S2 excluding the outer edge region S1.

  19 to FIG. 19 are plan views of pinhole contact lenses according to other examples in which the light shielding rate of the outer edge region S1 of the outer eye area 11a of the light shielding unit 11 is lower than the light shielding rate of the region S2 excluding the outer edge region S1. It shows in FIG.

  The scope of application of the present invention is not limited to the embodiment described above. The present invention is widely applicable to pinhole contact lenses and pinhole contact lens manufacturing methods capable of reducing ring-shaped shadows appearing in the field of view without deteriorating the visual quality due to the pinhole effect. Can be applied.

DESCRIPTION OF SYMBOLS 100 ... Contact lens 10 ... Main body 11 ... Light-shielding part 11a ... Outer eye side, 11b ... Corneal side 12 ... Pinhole part 13 ... Transparent area 30 ... Cornea 31 ..Retina 32 ... retina fovea 33 ... ring-shaped shadow

Claims (7)

A contact lens used by being attached to a human cornea, wherein the main body of the contact lens is disposed at the center of the cornea, the pinhole portion that is disposed at the center of the main body and forms a pinhole image on the retina, In a pinhole contact lens that is provided on the outer periphery of the pinhole portion and shields incident light incident from outside the eye, and a pinhole contact lens that is provided on the outer periphery of the light shielding portion and has a transparent region that allows the incident light to pass through.
The light shielding part, colored Mesotogawa black or dark, pinhole contact lens, characterized in that coloring the cornea side to the high Ishiro color reflectance than the eye outer colored in black or dark. The inner diameter of the colored portion of the cornea side colored in white color, pinhole contact lens according to claim 1, wherein greater than the inner diameter of the colored portion of the eye outer colored in black or dark. The outer diameter of the colored portion of the cornea side colored in white color, pinholes contact according to claim 1 or 2, characterized in that less than the outer diameter of the colored portion of the eye outer colored in black or dark lens.   4. The light shielding rate of the outer edge region outside the eye of the light shielding unit is lower than the light shielding rate of a region excluding the outer edge region outside the eye of the light shielding unit. The pinhole contact lens as described in any one. A contact lens that is used by being worn on a human cornea, and is disposed almost in the center of the main body of the contact lens, and is provided on a pinhole portion that forms a pinhole image on the retina, and provided outside the pinhole portion. A method of manufacturing a pinhole contact lens having a light-shielding portion that shields incident light incident from outside the eye, and a transparent region that is provided on an outer periphery of the light-shielding portion and transmits the incident light.
A first coloring step of annularly coloring a black or dark colorant into a part of the molding surface of the concave mold or a part of the concave semi-finished product having a thickness thinner than that of the contact lens to be a finished product;
Superimposed on the black or dark-colored colorant are colored the concave mold or in the concave semi within the product, the high Ishiro color of the colorant reflectance than the black or dark coloring agent for coloring the annular Two coloring steps;
A method for manufacturing a pinhole contact lens, comprising: In the second coloring step, pinholes of claim 5 in which the inner diameter of the annular colored portion is colored to white color, characterized in that the coloring to be larger than the inner diameter of the annular colored portion which is colored in black or dark Contact lens manufacturing method. In the second coloring step, the outer diameter of the annular colored portion is colored white color, to claim 5 or 6, characterized in that coloring to be smaller than the outer diameter of the annular colored portion which is colored in black or dark The manufacturing method of the pinhole contact lens of description.

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