JPWO2020016918A1 - Pinhole contact lens and method for manufacturing pinhole contact lens - Google Patents

Abstract

(EN) Provided are a pinhole contact lens and a method for manufacturing a pinhole contact lens capable of reducing 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 to be used by being attached to a human cornea, wherein a main body 10 of the contact lens 100 is arranged at the center of the cornea, and a pin is arranged at the center of the main body 10 and forms a pinhole image on the retina. The hole portion 12, the light shielding portion 11 provided on the outer contour of the pinhole portion 12 to shield the incident light incident from the outside of the eye, and the transparent region 13 provided on the outer contour of the light shielding portion 11 to pass the incident light. Have. The light-shielding portion 11 colors the outer side 11a of the eye in black or dark color and the corneal side in black or dark color having a higher reflectance than the outer side of the eye 11a to be colored light or white.

Description

The present invention relates to a pinhole contact lens that enables vision correction of myopia, hyperopia, astigmatism, presbyopia, and combinations thereof by utilizing the depth of focus obtained by the pinhole effect, and particularly reduces the quality of appearance. In particular, the present invention relates to a pinhole contact lens and a method for manufacturing a pinhole contact lens, in which a ring-shaped shadow can be reduced by a light-shielding portion that shields light to form a pinhole.

Soft contact lenses that are directly attached to the cornea are already widely used as vision correction tools.The method of manufacturing them is the lace cut method, in which a dry material is cut with a lathe, and the liquid material is rotated in a concave container (shaft tool). It was manufactured by a spin casting method of making the metal mold and an injection molding method of making the metal mold and the heat crosslink. In recent years, it has become possible to manufacture in a short time from injection molding which is crosslinked by heat, and molding by transparent or semitransparent resin mold and UV crosslinking, and disposable soft contact lenses (disposable contact lenses) have become mainstream.
In addition to conventional myopia and hyperopia correction (correction of spherical power), addition of toric lens for cylindrical power correction (correction of astigmatism power), multifocal contact lens for perspective correction or perspective correction, and color contact lens with strong cosmetic elements. There are also contact lenses with added value.

On the other hand, the pinhole effect has been known for a long time, and research into 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 has been carried out. It has been put to practical use as a camera. Although there are drawbacks such as resolution and image darkness, the greatest advantage of the pinhole effect is that it can project the subject on the screen etc. in focus without using the lens power because the depth of focus is used. ..
Applying the principle of a pinhole, which utilizes the fact that light that passes through a small pinhole (needle hole) projects an image on a screen, etc., and uses the depth of focus obtained by the pinhole effect, the light shield member and its center part There has already been an instrument for directly implanting (fitting) an annular mask (annular light-shielding portion) formed of the provided pinhole into the cornea by surgery.

For example, in “CORNEAL INLAY WITH NUTRIENT TRANSPORT STRUCTURES” disclosed in Patent Document 1, a corneal inlay and a mask, and a method of improving a patient's visual acuity using the corneal inlay and the mask. Has been proposed and a mask with an aperture has increased the depth of focus of the patient's eye and improved visual acuity. For example, the mask may comprise a central portion having a relatively high visible light transmission, such as an annular portion having a relatively low visible light transmission surrounding a transparent lens or aperture. This is an annular mask with a small aperture that allows light to pass through the retina so that the depth of focus increases, and is said to be applicable to contact lenses. This technology has already been commercialized, and the diameter of the annular mask is about 4.0 mm. This has the problem that when a ring-shaped mask is worn, the amount of light that enters the eye decreases and the field of view becomes dark. In particular, this lack of light amount is a problem that is noticeable in a dark place or under dark conditions. In order to solve the shortage of light quantity, the annular mask is provided with innumerable holes of thousands, and the visible light is transmitted through it along with nutrient transport, so that the shortage of light quantity due to the annular mask is compensated.

Furthermore, a technique combining these is being developed. For example, Patent Document 2 discloses a method in which an inner annular mask portion (annular light shielding portion) and an outer annular mask portion are provided. It uses the characteristic of the pupil that responds to brightness.In a bright place, the inner mask part with a high light blocking rate (low light transmittance) is used, and in a dark place or in dark conditions, the pupil dilates. It is designed to secure the light while maintaining the pinhole effect by taking the light energy into the eye from the outer annular mask part that has a low light blocking rate (the light transmittance is high) because the pupil becomes larger. ing.

Further, in Patent Document 3, by providing a small hole in the annular mask portion (annular light shielding portion), the incidence of light into the eye is promoted, the amount of light is secured, and the insufficient amount of light is solved.
FIG. 30 shows four examples of plan views of a pinhole contact lens according to a conventional example. Of these, the two examples in the upper part of 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 amount.
In addition, Patent Documents 4 to 18 show conventional contact lenses.

International Publication No. 2011/020074 International Publication No. 1995/008135 U.S. Patent No. 8308292 U.S. Pat.No. 5980040 International Publication No. 2007/057734 U.S. Pat.No. 5757458 International Publication No. 2000/052516 US Patent Application Publication No. 2005/0134793 US Patent Application Publication No. 2006/0265058 British Patent Application Publication No. 2458495 International Publication No. 2007/057734 International Publication No. 1997/048004 International Publication No. 1999/000694 JP 2013-109102 JP U.S. Pat.No. 9427311 JP 03-1857 A U.S. Pat.No. 5245367 U.S. Pat.No. 5,905,561

It is already known that there is an optimum pinhole diameter and shape for obtaining the pinhole effect when applied to a device for implanting an annular mask utilizing the pinhole effect into the cornea or a contact lens that brings the pinhole effect. ..

Also, it is desirable that the shape of the pinhole is a perfect circle because aberration will occur in shapes other than circles, and since only the light from the pinhole is projected on the screen, the visible light transmittance of the light shielding part is 0%. Is also known to be desirable. It is easy to think of a pinhole contact lens by combining this with a contact lens, but there is a limit to the resolution due to the pinhole effect as in a pinhole camera. In order to maximize the pinhole effect in a contact lens that applies the pinhole effect, or to obtain ideal resolution, the visible light transmittance of the annular light shield is 0% and its diameter is larger than the pupil diameter. Larger ones are preferable. However, in any of the conventional techniques described above, the diameter of the annular light shielding portion tends to be formed smaller in order to solve the shortage of light amount. In particular, when the annular light-shielding portion is smaller than the pupil diameter, light outside the eye enters the fovea of the retina in the eye from around the annular light-shielding portion (outer side), and thus it is difficult to obtain the original function as a pinhole effect.

When the pinhole principle is used for a contact lens, the highest quality visual acuity can be obtained by taking only the light incident from the pinhole formed in 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 amount, light other than light incident from the pinhole formed in the center of the contact lens, that is, Light entering from a plurality of holes provided in the annular light-shielding portion enters the fovea of the retina, resulting in a poor quality of appearance and a blurred image. That is, in order to solve the shortage of light quantity by providing multiple holes in the annular light shield or making the annular light shield semitransparent, in the pinhole contact lens, the conditions for maximizing the pinhole effect and the light quantity Since the conditions for solving the problem of deficiency are contradictory, the original purpose as a contact lens is to correct the visual acuity and the quality of appearance 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 shield is mounted on the cornea, the amount of light entering the eye is reduced, so that the wearer not only feels dark, but also the visual field is blocked by the annular light shield. We have not been able to solve the problem that ring-shaped shadows always appear. The ring-shaped shadow is always in the field of view while wearing contact lenses in a state like a resin eyeglass frame (frame), and the lower the visible light transmittance of the annular light-shielding portion (the higher the light-shielding property), the more the annular light-shielding portion. The larger the width (the distance between the inner diameter and the outer diameter), the more clearly it appears, which is uncomfortable. Especially, in a bright environment, it feels more uncomfortable.

An object of the present invention is to provide a pinhole contact lens and a method for manufacturing a pinhole contact lens capable of reducing 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 to be used by being attached to a human cornea, and the main body of the contact lens is arranged in the center of the cornea, and is arranged in the center of the main body to form a pinhole image on the retina. A pinhole portion for forming an image, a light-shielding portion that is provided on the outer contour of the pinhole portion to block incident light that enters from outside the eye, and a transparent region that is provided on the outer contour of the light-shielding portion and that allows the incident light to pass therethrough. In the pinhole contact lens having, the light-shielding portion is colored black or dark on the outer side of the eye, and is colored bright or white with a higher reflectance than the outer side of the eye on which the cornea side is colored black or dark. And

The inner diameter of the light-colored or white-colored colored portion on the cornea side may be larger than the inner diameter of the black-colored or dark-colored outer portion of the eye.

The outer diameter of the colored portion on the side of the cornea, which is colored light or white, may be smaller than the outer diameter of the colored portion on the outer side of the eye, which is colored black or dark.

The light blocking rate of the outer edge region on the outer side of the eye of the light blocking section may be lower than the light blocking rate of a region of the light blocking section excluding the outer edge region on the outer side of the eye.

A 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, the pin being arranged substantially at the center of the body of the contact lens and forming a pinhole image on the retina. A pinhole contact having a hole portion, a light-shielding portion that is provided outside the pinhole portion to shield incident light that enters from outside the eye, and a transparent region that is provided outside the light-shielding portion and that allows the incident light to pass therethrough. A method of manufacturing a lens, wherein a part of a concave molding surface or a concave semi-finished product having a thickness thinner than a contact lens to be a finished product is annularly colored with a black or dark colorant. The coloring step and the black or dark colorant colored in the concave mold or the concave semi-finished product are overlaid with a bright or white colorant having a higher reflectance than the black or dark colorant. And a second coloring step of coloring in a ring shape.

In the second coloring step, the inner diameter of the annular colored portion that is colored bright or white may be larger than the inner diameter of the annular colored portion that is colored black or dark.

In the second coloring step, the ring-shaped colored portion that is colored bright or white may be colored so that its outer diameter is smaller than the outer diameter of the ring-shaped colored portion that is colored 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 by utilizing the depth of focus provided by the pinhole portion.

According to the method of 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. It is possible to manufacture a pinhole contact lens capable of correcting any of myopia, hyperopia, astigmatism, presbyopia, and combinations thereof by utilizing the depth of focus of the pinhole portion.

FIG. 3 is a plan view of the pinhole contact lens according to the present embodiment. It is a bottom view of the pinhole contact lens according to the present embodiment. It is the sectional view on the AA line of the pinhole contact lens shown in FIG. It is explanatory drawing regarding the incident light which injects into an eye, 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 an eye|eye, and 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 when 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 attached the pinhole contact lens by a prior art example to the cornea. It is explanatory drawing which shows the state of a visual field when the pinhole contact lens by a prior art example is attached to the cornea. It is explanatory drawing of a cone cell and a rod cell in a retina. It is explanatory drawing of the manufacturing method of the pinhole contact lens of this embodiment. FIG. 8 is a plan view of a pinhole contact lens according to 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. FIG. 8 is a plan view of a pinhole contact lens according to 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. FIG. 8 is a plan view of a pinhole contact lens according to another example. FIG. 8 is a plan view of a pinhole contact lens according to another example. FIG. 8 is a plan view of a pinhole contact lens according to another example. FIG. 8 is a plan view of a pinhole contact lens according to another example. FIG. 8 is a plan view of a pinhole contact lens according to another example. FIG. 8 is a plan view of a pinhole contact lens according to another example. FIG. 8 is a plan view of a pinhole contact lens according to another example. FIG. 8 is a plan view of a pinhole contact lens according to another example. FIG. 8 is a plan view of a pinhole contact lens according to another example. FIG. 8 is a plan view of a pinhole contact lens according to another example. FIG. 8 is a plan view of a pinhole contact lens according to another example. It is four examples of the top views of the pinhole contact lens by a prior art example.

Embodiments of a pinhole contact lens and a method of manufacturing a pinhole contact lens according to the present invention will be described with reference to the drawings. However, the embodiments described below are merely examples, and are not intended to exclude various modifications and application of techniques not explicitly shown below. That is, the present invention can be implemented with various modifications (combining the embodiments) as long as the effects can be obtained. 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 proportions. The drawings may include portions having different dimensional relationships and ratios.

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 sectional view taken along the line AA of the pinhole contact lens shown in FIG. is there.
As shown in FIGS. 1 to 3, a pinhole contact lens 100 is a contact lens that is used by being worn on a human cornea, and a main body 10 of the pinhole contact lens is disposed in the center of the cornea 30. A pinhole portion 12 which is arranged at the center of the pinhole and forms a pinhole image on the retina, a light shielding portion 11 which is provided on the outer periphery of the pinhole portion 12 and shields incident light entering from outside the eye, and a light shielding portion 11 Is a pinhole contact lens having a transparent region 13 which is provided on the outer shell of the above and allows incident light to pass therethrough. The light-shielding portion 11 colors the outer eye 11a in black or dark color, and the cornea side 11b in bright or white with higher reflectance than the outer eye 11a colored in black or dark color.
In addition, in FIG. 1, the outer ocular surface 11a of the light shielding unit 11 is illustrated by drawing horizontal stripes in order to clearly show the dimension line and the code lead line. In the other drawings except FIG. 1, the outer side of the eye 11a of the light shielding portion 11 is shown in black.

FIG. 4 is an explanatory diagram regarding incident light entering the eye, and shows a state in which the pinhole contact lens of the present embodiment is attached to the cornea.
The main body 10 of the pinhole contact lens 100 is a member having a curved surface (curvature) that follows the surface shape of the cornea 30 and has a circular shape in a plan view, and is made of a light transmitting material that transmits incident light. As a material, it is formed by irradiating light and curing by a manufacturing method described later, for example, hydroxyethyl methacrylate (HEMA), N-vinylpyrrolidone (N-VP), dimethylacrylamide (DMAA), glycerol methacrylate (GMA). ), silicone hydrogel (SH) and the like are preferably used. Further, as the material of the main body 10, silicone rubber, butyl acrylate, dimethyl siloxane lens used for non-water-containing soft contact lenses, water-containing soft contact lenses and the like are also preferably used. It should be noted that a material having a color such as blue or red may be used instead of being transparent as long as it can transmit light.

The body 10 of the pinhole contact lens 100 is not limited to a soft contact lens and may be a hard contact lens. For example, as a material, a so-called oxygen permeable hard contact lens of siloxanyl methacrylate (SMA) type, which is slightly permeable to oxygen, or a hard contact lens of oxygen impermeable methyl methacrylate (MMA) is used. Silicone hydrogel lenses or hybrid contact lenses that combine the advantages of both soft 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 arranged substantially at the center of the main body 10 of the pinhole contact lens 100, and is located at a position including the optical axis connecting the center of the cornea 30 and the fovea centralis 32 of the retina 31. The substantially 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. The substantially center of the main body 10 of the contact lens 100 is also the substantially center of the light shielding portion 11. When mounted on the cornea 30, the light-shielding portion 11 provided on the outer periphery of the pinhole portion 12 limits the incident light incident on the cornea 30, and the light La passing through the pinhole portion 12 allows the wearer's fovea 32 Form a pinhole image on top.

The light blocking portion 11 has a circular shape in plan view having a curved surface (curvature) that follows the surface shape of the cornea 30, and blocks light that enters from outside the eye. The light-shielding portion 11 is colored black or dark on the convex side of the lens, that is, on the outside of the eye 11a (see FIGS. 1 and 3). On the other hand, the concave side of the lens, that is, the corneal side 11b in contact with the cornea 30 is colored bright or white (see FIGS. 2 and 3). The corneal side 11b may be a bright color or a white color having a reflectance higher than that of the eye outer side 11a which is colored black or dark.

The outer diameter D3 of the colored portion on the outer side 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 the dark place) that changes according to age.
FIG. 5 is an explanatory diagram regarding incident light that enters the eye, and is an example in the case where the outer diameter D3 of the colored portion on the outer eye 11a of the light shielding unit 11 is too small. As shown in the figure, if the outer diameter D3 of the colored portion on the eye outer side 11a of the light shielding portion 11 is too small, the area of the transparent region 13 that transmits the light Lb around the light shielding portion 11 becomes large. Then, although the peripheral visual field is widened, the light Lb other than the light La incident from the outside of the eye enters the fovea 32 of the retina 31. This causes a halo phenomenon and glare. In particular, when the pupil diameter becomes larger than the light-shielding portion 11 at night or the like, the light Lb from the transparent region 13 easily enters the fovea 32 and the quality of appearance is significantly deteriorated.

On the other hand, if the outer diameter D3 of the colored portion on the outer side of the eye 11a of the light shielding portion 11 is too large, the area of the transparent region 13 around the light shielding portion 11 becomes small, and it becomes impossible to secure the peripheral visual field. This is because it is not possible to secure the same visual field (visual sense) as the naked eye.

The outer diameter D3 of the colored portion on 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 particularly, the diameter is equal to or larger 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 of the light-shielding portion 11 on the corneal side 11b is preferably larger than the inner diameter D2 of the colored portion of the outer eye 11a. The outer diameter D5 of the colored portion of the light-shielding portion 11 on the cornea side 11b is preferably smaller than the outer diameter D3 of the colored portion of the outer 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 outer side 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 is not visible and is within an allowable range. 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 ocular surface 11a and the outer side of the 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 portion 11, a material or the like which has already been established to be safe and which is actually used in a soft contact lens with an iris is preferably used. For example, an azo colorant (red color) or a phthalocyanine colorant (blue color) can be used. For the black or dark color on the outside of the eye 11a, a carbon-based pigment or squid ink that is ecologically friendly may be used. In addition, conventionally known pigments and the like 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 main body 10 of the pinhole contact lens 100, that is, on the outer side of the eye when worn, as shown in the sectional view of FIG. preferable. When the light shielding portion 11 is arranged on the concave side (cornea side) of the body 10 of the pinhole contact lens 100, friction is increased due to the unevenness of the colored portion by the light shielding portion 11 made of a material different from that of the body 10 of the pinhole contact lens 100. Become. This is because it becomes easy to adhere to the cornea 30, which may cause a problem in safety.

The light shielding portion 11 may be sandwiched between the concave side and the convex side of the body material of the pinhole contact lens 100 so as not to be exposed. By disposing the light shielding portion 11 substantially at the center of the pinhole contact lens 100 in the thickness direction of the body 10, it is possible to provide a structure in which the light shielding portion 11 is not exposed to the outside. This can prevent the pinhole contact lens 100 from sticking to the cornea 30 and can also prevent unnecessary friction from being generated on the front surface or the rear surface of the pinhole contact lens 100. Therefore, it is possible to prevent the unevenness of the colored portion surface from coming into contact with the eyelid conjunctiva (the back side of the eyelid). At the time of blinking, it is possible to prevent the lens main body from moving largely due to the friction between the palpebral conjunctiva and the colored portion, and the center axis of the lens from deviating from the center of the cornea (optical axis), and stable visual acuity can be secured.

Next, the optimality of the diameter of the pinhole portion 12 (pinhole diameter) will be described. The inner diameter D2 of the colored portion on the eye outer side 11a of the light shielding portion 11 corresponds to the 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 to prevent aberration due to diffraction of incident light. Is desirable.

FIG. 9 is an explanatory diagram of the optimality of the pinhole diameter. As shown in CASE1 in FIG. 9, when the pinhole diameter is large, the amount of information from the subject is too large and an unclear image is formed. 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 also deteriorates. As shown in CASE2, if the pinhole diameter is optimum, an image with clear contrast can be obtained.

For the optimum pinhole diameter in the distance vision, b=r^2/λ (“r” is the radius of the pinhole, “λ” is the wavelength of light, and “b” is the focal length). For the optimum hole size, calculate the optimum hole size with the formula of c=ub/(u−b) (“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 values to the distance from the anterior surface of the cornea (corneal vertex) to the fundus (axial length), for example, the pinhole diameter is 1.0 mm to The range is 1.8 mm.

FIG. 10 is an explanatory view showing a state in which a conventional pinhole contact lens is attached to the cornea, and FIG. 11 is an explanatory view showing a state of a visual field when the conventional pinhole contact lens is attached to the cornea. FIG. 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 due to 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 the human eye, there are cone cells (shown by gray circles in FIG. 12) that discriminate shapes and rod cells (shown by black circles in FIG. 12) that have high sensitivity to sense light. To do. The pyramidal cells are present at the highest density in a central pit having a diameter of about 0.2 mm, which is further located at the center of the fovea 32 of the retina 31 having a diameter of about 1.0 mm, which is located in the recess of the retina 31 farthest from the cornea 30. On the other hand, since the rod cells are present around the retina 31 except the fovea 32, a plurality of holes other than the pinholes are provided in the light-shielding portion so that the light is incident on a place other than the fovea 32. However, there is no effect on the recovery of visual acuity, as it simply reduces the quality of appearance.

On the other hand, according to the pinhole contact lens 100 of the present embodiment, since the plurality of holes are not provided in the light shielding portion 11, the quality of appearance does not deteriorate.
The outer eye 11a of the light shield 11 is colored black or dark, but the cornea side 11b of the light shield 11 is colored black or dark with a higher reflectance than the outer eye 11a. It was white. As a result, it is possible to completely block the light entering the eye from the light blocking unit 11 and to reduce the quality of the pinhole effect, and to reduce the ring-shaped shadow 33 appearing in the field of view.

According to the pinhole contact lens 100 of this embodiment, it is possible to correct any of myopia, hyperopia, astigmatism, presbyopia, and combinations thereof by utilizing the depth of focus of the pinhole portion 12. You may add the frequency according to the state of a user's eyesight.

FIG. 13 is an explanatory view of the method for manufacturing the pinhole contact lens of this 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 to be the outer eye 11a of the light shielding portion 11 is put in a plate 21 in which the design of the light shielding portion 11 is etched (etched) in metal or resin (FIG. 13(A)). Transfer to a transfer body 20 made of curved silicon rubber or the like. Next, the transfer material 20 colored with the black or dark colorant 22 prints (colors) the black or dark colorant 22 in an annular shape on a part of the molding surface of the concave die 23 (first coloring step). (FIG. 13(B)).

Next, the light-colored or white colorant 26 having a higher reflectance than the black-colored or dark-colored colorant 22 is overlapped with the colored black-colored or dark-colored colorant 22 in the concave mold 23 to be annularly colored. Specifically, a bright or white colorant 26 which becomes the corneal side 11b of the light shield 11 is put 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 light-colored or white colorant 26 which becomes the corneal side 11b of the light-shielding portion 11 is superimposed (printed) on the previously printed (colored) black-colored or dark-colored colorant 22 (second coloring step). ) (FIG. 13D).

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

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

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

Further, the light shielding portion 11 may be arranged substantially at the center in the thickness direction of the body 10 of the pinhole contact lens 100. In this case (when the light shielding portion 11 is not exposed), a semi-finished product having a thickness thinner than that of the pinhole contact lens 100, which is a finished product, is prepared in advance, and the coloring agent 22 and the coloring agent 26 are annularly printed on the semi-finished product. It may be (colored).

Specifically, a smaller amount of the monomer 27 than the amount injected in FIG. 13(E) is injected into the concave mold 23, the convex mold 28 is clamped and cured, and the pinhole contact lens 100 as a finished product is used. Create a concave semi-finished product with a thin thickness. Then, the colorant 22 is annularly printed (colored) by the transfer body 20 in which a black or dark colorant 22 is colored on a part of the concave semifinished product (FIG. 13B). Since the process after FIG. 13C is the same as the process described above, the description thereof will be omitted.

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

In addition to the above-described configuration, in order to further reduce the ring-shaped shadow 33 that appears in the field of view due to the light-shielding portion 11 that constitutes the pinhole portion 12 in order to block light, in addition to the above-described configuration, The light blocking rate of the outer edge region S1 may be lower than the light blocking rate of the eye outer side 11a of the light blocking portion 11. Specifically, the light blocking rate of the outer edge region S1 on the outer eye 11a of the light blocking portion 11 may be set to be lower than the light blocking rate of the region S2 excluding the outer edge region S1.

14 is a plan view of a pinhole contact lens according to another example, FIG. 15 is an enlarged view of a main portion B surrounded by a broken line portion 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 examples shown in FIGS. 14 to 16, the outer edge region S1 of the eye outer side 11a of the light shielding portion 11 is configured such that light shielding portions that shield light are scattered in spots. As a result, the light blocking rate of the outer edge region S1 becomes lower than the light blocking rate of the portion other than the outer edge region S1, that is, the region S2 excluding the outer edge region S1. With 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. 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 blocking rate of the outer edge region S1 of the light blocking portion 11 outside the eye 11a may be lower than the light blocking rate of the region S2 excluding the outer edge region S1.

19A to 19C are plan views of pinhole contact lenses according to other examples in which the light blocking rate of the outer edge region S1 on the outer side 11a of the light blocking portion 11 is lower than the light blocking 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 above embodiment. INDUSTRIAL APPLICABILITY The present invention is widely applicable to a pinhole contact lens and a method for manufacturing the pinhole contact lens, which can reduce the ring-shaped shadow appearing in the field of view without deteriorating the quality of appearance due to the pinhole effect. Can be applied.

100... Contact lens 10... Main body 11... Light-shielding part 11a... Outer eye, 11b... Corneal side 12... Pinhole part 13... Transparent area 30... Corneal 31. ..Retina 32... Fovea of retina 33... Ring-shaped shadow

The pinhole contact lens of the present invention is a contact lens to be used by being attached to a human cornea, and the main body of the contact lens is arranged in the center of the cornea, and the main body of the contact lens is arranged in the center of the body to form a pinhole image on the retina. A pinhole portion for forming an image, a light-shielding portion that is provided on the outer contour of the pinhole portion to block incident light that enters from outside the eye, and a transparent region that is provided on the outer contour of the light-shielding portion and that allows the incident light to pass therethrough. 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.

A 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, the pin being arranged substantially at the center of the body of the contact lens and forming a pinhole image on the retina. A pinhole contact having a hole portion, a light-shielding portion that is provided outside the pinhole portion to shield incident light that enters from outside the eye, and a transparent region that is provided outside the light-shielding portion and that allows the incident light to pass therethrough. A method of manufacturing a lens, wherein a part of a concave molding surface or a concave semi-finished product having a thickness thinner than a contact lens to be a finished product is annularly colored with a black or dark colorant. 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 And a second coloring step of coloring.

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.

On the other hand, according to the pinhole contact lens 100 of the present embodiment, since the plurality of holes are not provided in the light shielding portion 11, the quality of appearance does not deteriorate.
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 .. As a result, it is possible to completely block the light entering the eye from the light blocking unit 11 and to reduce the quality of the pinhole effect, and to reduce the ring-shaped shadow 33 appearing in the field of view.

Claims (7)

A contact lens to be mounted on a human cornea for use, wherein a body of the contact lens is arranged in the center of the cornea, and a pinhole portion is arranged in the center of the body to form a pinhole image on the retina. In a pinhole contact lens having a light-shielding portion that is provided in the outer contour of the pinhole portion and that blocks incident light that enters from outside the eye, and a pinhole contact lens that is provided in the outer contour of the light-shielding portion and has a transparent region that allows the incident light to pass
The pinhole contact lens, wherein the light-shielding portion is colored black or dark on the outside of the eye and is colored black or dark on the side of the cornea to be colored bright or white with a higher reflectance than the outside of the eye. The pinhole contact lens according to claim 1, wherein an inner diameter of the light-colored or white-colored colored portion on the cornea side is larger than an inner diameter of the black-colored or dark-colored outer portion of the eye. The pin according to claim 1 or 2, wherein an outer diameter of the light-colored or white-colored colored portion on the cornea side is smaller than an outer diameter of the black-colored or dark-colored outer portion of the eye. Hall contact lens. 4. The light blocking rate of the outer edge region of the light blocking portion on the outer side of the eye is lower than the light blocking rate of a region of the light blocking section excluding the outer edge region of the outer eye. The pinhole contact lens according to any one of items. A contact lens to be worn on a cornea of a person, which is arranged substantially in the center of the body of the contact lens and which is provided on the outer periphery of the pinhole portion for forming a pinhole image on the retina. A light-shielding portion that shields incident light that enters from outside the eye, and a method of manufacturing a pinhole contact lens having a transparent region that is provided in the outer contour of the light-shielding portion and that allows the incident light to pass therethrough,
Part of the concave mold surface, or a part of the concave semi-finished product thinner than the contact lens to be a finished product, a first coloring step of annularly coloring a black or dark colorant,
The bright or white colorant having a higher reflectance than the black or dark colorant is annularly colored by superposing on the black or dark colorant colored in the concave mold or the concave semi-finished product. A second coloring step,
A method of manufacturing a pinhole contact lens, comprising: The said 2nd coloring process WHEREIN: It colors so that the inner diameter of the annular coloring part colored in bright color or white may become larger than the inner diameter of the annular coloring part colored in black or dark color. Pinhole contact lens manufacturing method. In the second coloring step, coloring is performed such that the outer diameter of the ring-shaped colored portion that is colored light or white is smaller than the outer diameter of the ring-shaped colored portion that is colored black or dark. 6. The method for manufacturing a pinhole contact lens according to item 6.

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