JPH05188329A - Contact lens - Google Patents

Abstract

PURPOSE:To obtain the contact lens by which a standard of the contact lens can be known easily from its external appearance by coloring it in a different color in accordance with a difference of the standard. CONSTITUTION:In two pieces or more of contact lenses having different standards, they are colored in different colors in accordance with a difference of the standards. In this case, as for the standards, the diameter, thickness, a base curve, lens power, etc., are given and also, there are the kind of a raw material, a lens design, a manufacture, a manufacturer's serial number, etc. As for a method for coloring in different colors, a method for coloring with different pigments are used, and also, a method for shading by using the same pigment, etc., are used. In such a way, that information related to a standard of a contact lens is obtained by an external appearance, the contact lens worn by a patient himself can be discriminated easily, and danger of erroneous wear can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact lens whose standard can be identified by its appearance.

[0002]

2. Description of the Related Art As for contact lenses, various ophthalmic examinations on patients determine the prescription of contact lenses that can be worn safely. Lens specifications for which this prescription is determined include diameter, thickness, base curve, lens power (apex refractive power), and the like. Furthermore, the type of material, lens design, manufacturing maker, etc. can be said to be important standards for prescription. Human eyesight and corneal shape are often different even on the left and right, and as a result, a wide variety of contact lenses are prescribed for each patient. If patients wear contact lenses that do not meet the prescribed specifications, they may not only improve vision impairment but may also cause ocular disorders such as corneal disorders. However, since most contact lenses are colorless and transparent and have a small diameter, it is not possible to easily determine the standard of the contact lens from the appearance. This puts the patient at risk of accidentally wearing contact lenses of different specifications than the correct prescription.

When the standard of the contact lens is not known, for example, the lens power is measured with a lens meter, and the base curve is measured with a special scope such as a radius scope.
Therefore, as a method to obtain information about the standard of contact lenses without performing measurement with such a special measuring instrument, conventionally, a method of engraving small numbers or letters on the periphery or stamping with a dye is used. Came. However, with such a marking method, it is difficult for the patient who wears the contact lens to know some information about the standard of the contact lens by naked eye observation, and the contact lens of the patient with the wrong standard is used in daily life. The risk of wearing was not improved.
Therefore, there is a demand for a contact lens that allows the patient to easily know even a part of the information about the standard of the contact lens to be worn and to confirm whether or not it should be worn.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and provides a contact lens capable of easily knowing the information about the standard of the contact lens from its appearance. With the goal.

[0005]

The present invention has the following constitution in order to achieve the above object.

"Contact lens characterized in that two or more contact lenses having different standards are colored in different colors depending on the standards." Two or more contact lenses having different standards of the present invention Means that at least two of the contact lenses have different standards. For two or more contact lenses having different standards, the standards include diameter, thickness, base curve, lens power and the like. In addition, there are material types, lens designs, manufacturers, and serial numbers. In the present invention, by coloring in different colors depending on the standard, information about the standard can be obtained from its appearance. For example, there are three types of hard contact lenses with diameters of 8.5 mm, 8.8 mm, and 9.0 mm.
Two types of thickness 0.15mm and 0.18mm, base curve 7.20mm ~ 8.50mm 27 in 0.05mm increments, lens power 0.5 from -20D to + 20D.
81 types in D increments, 3 × 2 × 2 with different standards
There are 7 × 81 = 13122 types of contact lenses,
These are colored in different colors. Furthermore, when distinguishing other than the type of material and the lens design, more colors are used. From the appearance of the contact lens colored in this way, the standard value corresponding to the color can be easily known.

If all of the above information is not necessarily required, for example, only the base curve, the lens power and the lens diameter, and the left and right prescription lenses are different. When only the right eye and the left eye need to be distinguished, there are different standards based on only one standard, such as information on contact lens diameter only, information on base curve only, information only on lens power. Items may be colored in different colors, or similarly, only two standards may be used as a reference. Further, in the present invention, for example, in one standard such as lens power, it is not limited to changing the colors for all standard values for a large number of types, and it is not the actual standard to change the color to be colored. You may change by a coarser step than the step. For example, there are three types of hard contact lenses with diameters of 8.5 mm, 8.8 mm and 9.0 mm, two types with thicknesses of 0.15 mm and 0.18 mm, and a base curve of 7.20 to 8.50 of 0.05 mm. 27 kinds in increments, lens power 81 in 0.5D increments from -20D to + 20D
In the case of seeds, when the contact lens diameter is used as a standard for different standards, three different colors are colored depending on the difference in diameter. When the lens power is used as a reference, it is colored in 81 different colors. Further, in this case, if it is only necessary to judge from the appearance whether + power or −power, + and − are colored in different colors. Further, it can be divided into a low power lens of 0 to 3D, a medium power lens of 3 to 6D, and a high power lens of 6D or more, and can be colored with three kinds of colors. If only the base curve is used as a reference, it will be colored in 27 different colors. Further, when it is desired to obtain information about the lens power and the base curve from the appearance, it is colored in 81 × 66 = 5346 types. In addition, the left and right eyes are colored differently for patients who have different prescriptions and lenses with different specifications. Coloring can be increased based on the above classification, but the color is not particularly limited thereto.

As a method of coloring with different colors according to the standard of contact lenses, a method of coloring with different dyes is used. It is also possible to use a method in which the same dye is used to create a shade. Further, it is possible to use two or more kinds of dyes and change the color tone depending on the mixing ratio thereof. As a coloring method, a pigment is added in advance during the polymerization of a plastic for contact lenses, a transparent plastic is molded into a contact lens and then colored, or a combination of these two methods, a contact lens made of a pigment-containing material. It is possible to change the color tone by further coloring. Considering the durability of coloring among these methods, it is preferable to add a colorant in advance during polymerization. As dyes, direct dyes, oil-soluble dyes, acid dyes, basic dyes, disperse dyes,
Vat dyes, organic pigment dyes and the like can be used.
Examples of those that can be used among these dyes are Solvent Red 8, Solvent Red 23, Solvent Red 30, Solvent Red 48, Solvent Red 81,
Solvent Red 82, Solvent Red 83, Solvent Red 84, Solvent Red 100, Solvent Red 118, Solvent Red 119, Solvent Red 177, Sylvent Violet 2, Solvent Violet 13, Solvent Violet 21, Solvent Orange 2, Solvent Orange 5, Solvent 5. Orange 6, solvent orange 7, solvent orange 40, solvent orange 44, solvent orange 4
5, Solvent Orange 71, Solvent Yellow 5,
Solvent yellow 6, solvent yellow 15, solvent yellow 18, solvent orange 56, solvent yellow 21, solvent yellow 25, solvent yellow 32, solvent yellow 33, solvent yellow 79, solvent yellow 160, solvent blue 25, solvent blue 55, solvent blue 67, Solvent Blue 70, Solvent Blue 94, Solvent Green 3, Solvent Brown 37, Solvent Brown 58, Solvent Black 22, Solvent Black 23, Solvent Black 27, Solvent Black 34, Solvent Black 42, Disperse Yellow 160, Disperse Red 5 , Disperse Orange 61, Disperse Blue 198, Disperse Violet 3 , Acid Yellow 3, Acid Yellow 73, Acid Yellow 236, Acid Red 21, Acid Red 27, Acid Red 51, Acid Red 95, Acid Orange 7, Acid Orange 20, Acid Blue 9, Acid Blue 74, Acid Blue 193, Acid Green 1, Acid Green 5, Acid Green 25, Acid Violet 9, Acid Black 1, Acid Black 194, Pigment Red 3, Pigment Red 4, Pigment Red 24, Pigment Red 49, Pigment Red 6
4, Pigment Red 88, Pigment Red 102,
Pigment Red 104, Pigment Red 123, Pigment Red 149, Pigment Red 170, Pigment Red 178, Pigment Orange 1, Pigment Orange 5, Pigment Orange 13, Pigment Orange 34, Pigment Yellow 1, Pigment Yellow 12, Pigment Yellow 13, Pigment Yellow. 34, Pigment Yellow 35, Pigment Yellow 8
3, Pigment Yellow 138, Pigment Yellow 1
39, Pigment Yellow 183, Pigment Blue 1
5, Pigment Blue 28, Pigment Blue 29, Pigment Blue 36, Pigment Blue 60, Pigment Green 7, Pigment Green 8, Pigment Green 17, Pigment Green 19, Pigment Green 36, Pigment Violet 23, Pigment Brown 6, Pigment Brown 24, Pigment Brown 31, Pigment Black 1, Pigment Black 9,
Pigment Black 11, Pigment Black 13, Butt Red 1, Butt Orange 1, Butt Orange 5,
Bat Blue 1, Bat Blue 6, Food Green 3,
Hood Red 1, Hood Red 6, etc.
It is not limited to these.

The density is preferably such that it does not change the color of the iris or white of the eye seen through the cornea, and that the lens standard can be distinguished from the appearance. Specifically, in a corneal lens, the transmittance at the maximum absorption wavelength in the visible light region of 400 to 800 nm is 30 to 95%, and in the lens that covers a part of the white eye, the transmittance is about 70 to 98%. Is desirable.

Hereinafter, the present invention will be described more specifically with reference to examples.

[0011]

【Example】

Example 1 Contact lenses colored differently according to the difference in lens power among the contact lens standards were manufactured.

First, a contact lens for a plus lens was manufactured.

A soft contact lens having a water content of 35% and a lens power of +3.0 D was used. 0.5 g of Disperse Red 5 was added to 60 g of methanol and stirred at 30 ° C. to obtain a dyeing solution. Methanol 10 in advance
%: 90% (weight ratio) of water is dipped in a sufficiently swollen soft contact lens to be mixed with the above dyeing solution.
After immersing for about 3 minutes at 0 ° C., the lens was taken out and put into a large amount of water for washing to remove unnecessary dye adhering thereto. The obtained contact lens was uniformly colored in transparent red.

Next, a contact lens for a minus lens was produced.

A soft contact lens having a water content of 35% and a lens power of -3.0D was used. 0.3 g of Disperse Blue 198 was added to 60 g of methanol and stirred at 30 ° C. to obtain a dyeing solution. The soft contact lens, which was previously dipped in a mixed solution of methanol 10%: water 90% (weight ratio) and sufficiently swollen, was dipped in the above dyeing solution at 30 ° C. for about 5 minutes, and then the lens was taken out and placed in a large amount of water. And washed to remove unnecessary dye adhering thereto. The obtained contact lens was uniformly colored in transparent blue.

As a result, negative-power and positive-power soft contact lenses colored in different colors were obtained, and the difference was easily identifiable.

Example 2 A contact lens was prepared by coloring left-eye lenses and right-eye lenses having different specifications among contact lens specifications in different colors.

First, a contact lens for the left eye was produced.

90 parts by weight of methyl methacrylate, 5 parts by weight of ethylene glycol dimethacrylate, 5 parts by weight of methacrylic acid, 0.05 part by weight of azobisisobutylnitrile as an initiator, 0.05 part by weight of azobiscyclohexylcarbonitrile, and a colorant. Solvent Red 84
Was dissolved in 0.015 parts by weight, and this was placed in a rod-shaped glass container and deaerated. This was held at 60 to 120 ° C. for 36 hours for polymerization. The contents were taken out and cut and polished to obtain a red transparent contact lens having a lens diameter of 8.8 mm, a base curve of 7.9 mm and a lens power of −3.00D.

Next, a contact lens for the right eye was produced.

A polymer was obtained in the same manner as for the above left eye, except that Solvent Blue 70 was used as the dye. Cutting and polishing this, lens diameter 8.8mm, base curve 8.0m
A blue transparent contact lens having a lens power of m and a lens power of -4.00 D was obtained. As a result, the left-eye lens and the right-eye lens having different standards could be easily identified from their appearances.

Example 3 A contact lens colored differently according to the difference in the base curve among the contact lens standards was produced.

90 parts by weight of methyl methacrylate, 5 parts by weight of ethylene glycol dimethacrylate, 5 parts by weight of methacrylic acid, 0.05 part by weight of azobisisobutylnitrile as an initiator, 0.05 part by weight of azobiscyclohexylcarbonitrile, and a colorant. Solvent Blue 94
Was dissolved in 0.015 parts by weight, and this was placed in a rod-shaped glass container and deaerated. This was held at 60 to 120 ° C. for 36 hours for polymerization. The contents are taken out, cut and polished, and the lens diameter is 8.8 mm, the lens power is +3.00 D, and the base curves are 7.7, 7.8, 7.9 and 8.0, respectively.
An 8.1 mm transparent blue lens was obtained.

Next, 0.5 g of Disperse Red 5 was added to 60 g of methanol and stirred at 30 ° C. to obtain a dyeing solution A. The contact lens having the base curve of 7.7 mm obtained above was immersed in this dyeing solution A at 30 ° C. for 9 minutes. After the immersion, the lens was washed with a large amount of water to remove unnecessary dye adhering to the lens. The obtained contact lens was uniformly colored in reddish purple. In addition, a contact lens with a base curve of 7.8 mm was added to this staining solution A at 30 ° C. for 6 hours.
Soaked for a minute. After the immersion, the lens was washed with a large amount of water to remove unnecessary dye adhering to the lens. The obtained contact lens was uniformly colored violet.

Next, 0.5 g of Disperse Yellow 16
0 was added to 60 g of ethanol, and the mixture was stirred at 40 ° C., which was used as dyeing solution B. The contact lens having the base curve of 8.1 mm obtained above was dipped in the dyeing solution B at 40 ° C. for 9 minutes. After the immersion, the lens was washed with a large amount of water to remove unnecessary dye adhering to the lens. The obtained contact lens was uniformly colored yellowish green. Further, a contact lens having a base curve of 8.0 mm was immersed in this dyeing solution B at 40 ° C. for 6 minutes. After the immersion, the lens was washed with a large amount of water to remove unnecessary dye adhering to the lens. The obtained contact lens was uniformly colored blue-green.

The contact lens thus obtained has a lens diameter of 8.8 mm, a lens power of +3.00 D,
The base curve of 7.7 mm is magenta, 7.8 mm is violet,
7.9 mm was colored in blue, 8.0 mm was colored in blue-green, and 8.1 mm was colored in yellow-green. As a result, the base curve could be easily identified from the appearance of the contact lens.

[0027]

According to the present invention, since the information about the contact lens standard can be obtained from the appearance, the patient can easily identify the contact lens to be worn, and the effect of preventing the risk of misuse can be obtained. Have. Also,
Not only the patient but also the doctor and the paramedical assistant can easily recognize the lens standard, so that the lens can be handled accurately.

Claims (5)

[Claims] 1. A contact lens comprising two or more contact lenses having different standards, which are colored in different colors depending on the standards. 2. The contact lens according to claim 1, wherein the two or more contact lenses having different standards are two contact lenses for the left eye and the right eye. 3. The contact lens according to claim 1, wherein the two or more contact lenses having different standards are contact lenses having different lens powers. 4. The contact lens according to claim 1, wherein the two or more contact lenses having different standards are contact lenses having different lens base curves. 5. The contact lens according to claim 1, wherein the two or more contact lenses having different standards are contact lenses having different lens diameters.