JPH01319018A - Soft synthetic resin lens for sight correction - Google Patents

Abstract

PURPOSE:To easily produce the additive lens having required refracting power in a short period of time by bringing the attachable and detachable soft synthetic resin lens into tight contact with a part of spectacle lenses. CONSTITUTION:A convex mold 3 is held by a gasket 4 and a space 1 having a suitable thickness is formed between a concave spectacle lens 2 and the mold 3. A photosensitive resin monomer is injected through an injection port 5 into the space. The photosensitive resin monomer is then polymerized and cured by irradiation of UV rays for 5 minutes by which the soft synthetic resin lens l1 is formed. The soft synthetic resin lens l1 and the spectacle lens 2 are brought into tight contact with each other by some tackiness of the soft synthetic resin lens surface and the airtightness between both if the soft synthetic resin lens is applied on the desired position of the spectacle lens 2 and the central part thereof is lightly pressed with the fingertip. The lens for sight correction having the desired addition is obtd. on the spot in this way so as to meet the spectacle wearer's request.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to eyeglass lenses, goggle eyeglass lenses, and underwater (8-mirror lenses) for vision correction in which a soft synthetic resin lens having refractive power is brought into close contact with a portion of the lens. It is placed between the lens.

"Conventional technology" The eyeglass lenses for vision correction currently in common use are:
These are lenses for vision correction of myopia, farsightedness, astigmatism, and presbyopia, or combination lenses thereof.

There are also sunglasses, goggles, and underwater glasses that are equipped with lenses without refractive power and are not intended for vision correction but only for the purpose of blocking light, windshielding, or waterproofing.

Vision correction lenses are usually single vision lenses that have only one type of refractive power depending on the purpose of use. Lenses for correcting nearsightedness, farsightedness, and astigmatism are used only for distance vision; Corrective lenses are used only for near vision.

For all humans, the accommodation power of the eyes gradually declines after the age of 40, and near vision becomes difficult with each passing year. Presbyopia-correcting glasses are required for this purpose.

In this case, if the two eyeglass lenses are single-focal lenses that have only one type of refractive power, you will have to change the eyeglasses and eyeglasses to match the purpose as needed, and the eyeglass lenses for that purpose will require replacement eyeglasses. There is the inconvenience of having to carry it with you all the time.

As a means to solve this problem, there is a multifocal lens in which a part of the spectacle lens for correcting distance vision has refractive power for correcting presbyopia.

However, even if such a multifocal lens is of a stepless type, distortion occurs in the visual image at the boundary between parts having different refractive powers, giving a feeling of discomfort or strangeness.

As described above, both single-focal lenses and multifocal lenses have drawbacks in terms of wearability.

In order to compensate for these drawbacks, there have been methods in which "another lens having refractive power" is attached to the spectacle lenses worn by spectacle wearers using Canada balsam or an adhesive.

However, in the case of these methods, in order to peel off the glued lens, it is necessary to melt the Canada balsam by heating or peel the glued lens using a solvent, and then remove the adhesive residue stuck to the eyeglass lens. This required complicated and difficult work. Moreover, if organic solvents are carelessly used to remove adhesives, synthetic resin eyeglass lenses and frames may dissolve or change in quality.

It may cause discoloration or damage.

Furthermore, there are lenses made of soft synthetic resin that are attached to the spectacle lens by a suction cup action corresponding to the curvature of the front or back surface of the spectacle lens.

However, the power of the eyeglass lenses worn by eyeglass wearers differs from person to person, and the curvature of the front and back surfaces that make up the lenses varies widely, so it is possible to accommodate any lens curvature. In order to make lenses made of soft synthetic resin, a huge number of molds are required, resulting in extremely high production costs. Even if the number of molds is reduced to the minimum necessary by grouping molds with similar radii of curvature to reduce production costs, if the curvatures of both suction surfaces are even slightly different, it will be difficult to use them.
This causes the inconvenience that the soft synthetic resin lens does not stick to the eyeglass lens and falls off.

The reason is that when a soft synthetic resin lens is attached to the surface of an eyeglass lens, the soft synthetic resin lens side becomes a concave surface and the eyeglass lens side becomes a convex surface, but the radius of concave curvature of the soft synthetic resin lens When the radius of curvature of the convex surface of the lens is larger than that of the lens, the soft synthetic resin lens does not stick to the spectacle lens and falls off. In addition, when a soft synthetic resin lens is attached to the back surface of a spectacle lens, the soft synthetic resin lens side becomes a convex surface and the spectacle lens side becomes a concave surface, but the radius of curvature of the convex surface of the soft synthetic resin lens is the concave surface of the spectacle lens. When the radius of curvature is smaller than the radius of curvature, the soft synthetic resin lens does not stick to the spectacle lens and falls off.

Furthermore, since soft synthetic resin lenses are highly elastic and flexible, when they are adsorbed onto curved surfaces with different curvatures, pressure is applied beyond the lens's performance tolerance, causing distortion and plastic deformation, resulting in poor optical performance. is significantly inhibited.

As described above, both the adhesive type and adsorption type of the conventional technology for additional lenses for changing the refractive power of a portion of a spectacle lens have a number of drawbacks.

[Problems to be Solved by the Invention] It is possible to eliminate the drawbacks of the spectacle lenses and additional lenses according to the prior art as described above, and to easily and quickly manufacture "additional lenses having the necessary refractive power". The objective is to provide a soft synthetic resin lens for vision correction that has low production costs, is small and lightweight, is convenient to carry, and has excellent performance when worn. be.

[Means for Solving the Problems] An object of the present invention is to provide a vision correction lens made of soft synthetic resin that can be freely attached to and removed from a portion of a spectacle lens, a goggle spectacle lens, and an underwater spectacle lens worn by a spectacle wearer. There is a particular thing.

[Function] The present invention uses either the front or back side of eyeglass lenses worn by eyeglass wearers as a mold for the soft synthetic resin lens attachment side, and polymerizes and hardens photosensitive resin monomers. This is a vision correction lens characterized by the following.

The present invention is characterized in that the soft synthetic resin lens is a synthetic resin selected from among photosensitive resins that are optically transparent and have the necessary flexibility after curing.

Since the present invention is made by polymerizing and curing a photosensitive resin by irradiating ultraviolet rays, the mold and gasket when one side of the eyeglass lens is not molded are characterized by extremely good ultraviolet transmittance.

The present invention is a vision correction lens made of soft synthetic resin, which is manufactured by a plastic molding method using the so-called "cast molding method."

"Embodiments" Examples of the present invention will be described below with reference to the drawings.

First, FIG. 1 shows that when a concave eyeglass lens 2 is used as a mold, a convex mold 3 is held with a gasket 4, and a space 1 with an appropriate thickness is created between the concave eyeglass lens 2 and the convex mold 3. This figure shows the state in which a photosensitive resin monomer is injected through the injection port 5. The convex mold 3 and the gasket 4 are characterized by extremely good ultraviolet transmittance, and are irradiated with ultraviolet light for 5 minutes to cure the photosensitive resin monomer.

Figure 2 shows a soft synthetic resin lens 1 that has been molded and polymerized and hardened.
′.

Figure 3 shows a soft synthetic resin lens 1 that has been molded and cured by polymerization.
FIG.

When attaching the soft synthetic resin lens 1' to @Kaneshinzu 2, place the soft synthetic resin lens at the desired position on the eyeglass lens and lightly press the center with your fingertips. The two stick together due to the adhesiveness of the rain and the airtightness between the rain sounds. In this case, if water is interposed in the lWJ, air bubbles will not be generated and the soft synthetic resin lens 1'
The lens adheres firmly and stably to the required mounting position on the eyeglass lens surface without causing any optical distortion.

A feature of the present invention is that the curvature of the front or back surface of the eyeglass lens worn by an individual eyeglass wearer is used as a mold for making the curvature of the eyeglass lens side of a soft synthetic resin lens,
The object of the present invention is to mold a soft synthetic resin lens for vision correction by using it together with a mold having opposite surface curvature to form a necessary addition power (refractive power).

The present invention is characterized by the time required for preparatory work, ultraviolet irradiation work, and finishing treatment when manufacturing soft synthetic resin lenses having the refractive power desired by the orderer in response to orders from individual eyeglass wearers. Each takes several minutes, and the time required for production is extremely short. Therefore, when receiving an order for a soft synthetic resin lens, a soft synthetic resin lens having the refractive power desired by the orderer can be immediately provided on the spot. In addition, the soft synthetic resin lens according to the present invention is extremely small and will not be damaged or deteriorated even when used frequently, so it is convenient to carry at all times and can withstand frequent use.

Moreover, this soft synthetic resin lens is salty.

It does not cause any chemical changes when exposed to acids and solvents such as benzine and alcohol, and does not cause discoloration, deterioration, staining, or damage.

As described above, the soft synthetic resin lens according to the present invention fully compensates for the drawbacks of conventional eyeglass lenses and adhesive or suction type additional lenses attached thereto, and has high practical value.

Next, a description will be given based on a specific example.

<Example 1> When making a soft synthetic resin lens with an addition power of +2.QODJ to be attached to a near vision lens worn by a spectacle wearer, the radius of concave curvature of the back surface curve of the spectacle lens is 59 .8 mm (concave surface 8.75 curve), the back surface (concave surface) of the eyeglass lens is used as a mold on the eyeglass lens mounting surface side, and the convex surface curvature radius is 77.5.
mm (convex surface 6.75 curve) and fixed them with gaskets to form a space between the eyeglass lens (concave surface mold) and the convex surface mold, and after curing, a flexible photosensitive resin monomer is injected, When irradiated with ultraviolet light for 5 minutes to polymerize and harden, a soft synthetic resin lens with an addition power of +2.00 DJ is produced.

In this way, by using a mold with a predetermined curvature corresponding to the curvature of the eyeglass lens surface, a soft synthetic resin lens having the necessary addition power (refractive power) can be produced in a molded state.

After being cured by ultraviolet irradiation, the gasket and convex mold are removed, and the molded soft synthetic resin lens is cut into the required shape with a sharp knife to match the shape of the wearer's eyeglass frame.

<Example 2> FIG. 4 is a sectional view showing an example of a method for manufacturing a soft synthetic resin lens of the present invention by a cast molding method.

When making soft synthetic resin lenses to be attached to eyeglass lenses that have a generally constant curvature, such as sunglass lenses (most are made with a radius of curvature of 87 mm), or flat lenses such as underwater glasses lenses. , molds 2' and 3 for each image having the necessary curvature to obtain a predetermined refractive power are made, a photosensitive resin monomer is injected into the molded space fixed with a gasket, and ultraviolet rays are irradiated for 5 minutes. Polymerize and harden. In this case, the mold and gasket used have extremely good ultraviolet transmittance.

The soft synthetic resin lens molded and cured through the above steps is finished by the same method as the post-processing in "Example 1" above.

According to this method, it is possible to mass-produce vision correction lenses made of soft synthetic resin and having a wide variety of refractive powers.

<Example 3> As shown in Figure 6, the soft synthetic resin lens is pasted on the inner surface of a thin hard synthetic resin plate (folded in half and the size of a telephone card), and carried by storing it in a commuter pass or the like. This allows it to be protected from damage while being carried.

[Effects of the Invention] The soft synthetic resin lens of the present invention can provide a vision correction lens having a desired addition power (refractive power) immediately and on the spot in response to the request of a spectacle wearer, and is suitable for eyeglass wearers. By carrying this at all times, a person can immediately wear a vision correcting lens that is suitable for the purpose when he or she wants to adjust his or her vision to a distance other than the usual focal length (for example, in the following cases). effective.

In addition, the soft synthetic resin lens of the present invention is extremely small and lightweight, so it can be carried in an accessory case such as a wallet or commuter pass, making it extremely convenient.

A. When a person who normally wears intermediate-distance glasses for home use watches a movie.

B. When a wearer of goggles or underwater glasses without refractive power requires a corrective lens for distance use.

When a person working with a welding light-shielding plate that does not have C9 refractive power requires near vision correction lenses.

D. When a wearer of sunglasses without refractive power requires near vision correcting lenses.

When glasses wearers who require F9-strength corrective lenses (especially myopia corrective lenses) wear large sunglass frames,
When you wish to wear a vision correction lens on even a portion of the lens.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the manufacturing process of a soft synthetic resin lens of the present invention. FIG. 2 is a sectional view showing an example of a soft synthetic resin lens molded to form a vision correction lens of the present invention. FIG. 3 is a sectional view showing a state in which the soft synthetic resin lens of the present invention is attached to a spectacle lens. FIG. 4 is a sectional view showing an embodiment of the manufacturing process of the soft synthetic resin lens of the vision correction lens of the present invention by a cast molding method. FIG. 5 is a partial perspective view of an embodiment of the soft synthetic resin lens of the present invention attached to a spectacle lens. FIG. 6 is a perspective view showing the soft synthetic resin lens of the present invention attached to a carrying tool. 1... Photosensitive resin monomer 1'... Soft synthetic resin lens 2... Concave eyeglass lens 2'... Concave mold for mass production 3... Convex mold 4... Gasket 5... ... Inlet 6 ... Ultraviolet irradiation device 7 ... ■Mirror frame 8 ... Carrying tool

Claims (5)

[Claims] (1) A vision correction lens comprising a removable soft synthetic resin lens closely attached to a portion of a spectacle lens, a goggle spectacle lens, or an underwater spectacle lens. (2) Compatible with the wide variety of curvatures that eyeglass lenses have,
The vision correction lens according to claim 1, characterized in that either the front or back surface of the spectacle lens is used as a mold. (3) The vision correction lens according to claim 1 or 2, which can be mass-produced using a mold having a preset curvature. (4) The soft synthetic resin lens is a synthetic resin selected from among photosensitive resins that are optically transparent and have sufficient flexibility after curing.
Lenses for vision correction according to item 2 or 3. (5) The mold for polymerizing and curing the photosensitive resin (excluding cases where eyeglass lenses are used) and the gasket have extremely good ultraviolet transmittance. Lenses for vision correction as described in Section 2, Section 2, Section 3, or Section 4.