KR20160129305A - Manufacturing method for contact lenses blocking blue light and contact lenses blocking blue light made thereof - Google Patents

Abstract

The present invention relates to a method of manufacturing a contact lens in which a blue light shielding part is embedded in a lens and a blue light shielding contact lens manufactured by the manufacturing method. More particularly, the present invention relates to a blue light shielding contact lens, The blue light shielding film can be embedded in the lens, so that the blue light shielding film does not touch the eyeball when the wearer wears it, so that the user can feel comfortable without wearing the eyeball when worn. And a blue light blocking contact lens manufactured by the manufacturing method.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a blue light blocking contact lens and a blue light blocking contact lens manufactured by the manufacturing method,

The present invention relates to a method of manufacturing a blue light blocking contact lens and a blue light blocking contact lens manufactured by the manufacturing method. More particularly, the present invention relates to a blue light blocking contact lens manufactured in advance and a blue light blocking film To a method of manufacturing a blocking contact lens and a blue light blocking contact lens manufactured by the manufacturing method.

Light is a type of electromagnetic wave including visible light (380 nm to 780 nm), ultraviolet light (380 nm or less) and infrared light (700 nm or more), and includes X-ray or gamma ray.

The visible light means a wavelength range from a violet system (about 380 nm) to a red system (about 700 nm), in which a human can see objects. In particular, blue light is a purple system visible light, And the focus is made in front of the retina, so that the sharpness of the image is relatively decreased, which causes eye fatigue.

Specifically, when light is absorbed by the photoreceptor cells in the eye, the cells become insensitive until they are recovered, which is a metabolic process. The absorption of blue light has been shown to reverse the recovery process prematurely, and this early reversal has been studied to increase the risk of injury and to cause the accumulation of lipofuscin in the retina. In particular, accumulation of the lipofuscin occurs in the RPE layer, where the extracellular material drusen is aggregated in the RPE layer due to excessive amounts of lipofuscin, Are known to cause damage or death of these cells as they interfere with or block the delivery of nutrients to the receptor.

In addition, blue light has a problem of increasing eye fatigue because it gives strong stimulus to the optic nerve in that it has high energy and high penetration power.

Therefore, studies have been made on a lens for preventing the transmission of blue light. Conventionally, a technique for attaching a film having a function of blocking blue light to the electronic device itself has been attempted. For example, an electromagnetic wave shielding film for mobile phones has been devised, which is a publicly-known 20-1999-0039927, which is a shielding plate having a structure in which a fiber cloth having a predetermined mesh is sandwiched by a copper-plated shield pad between two transparent synthetic resin films The shield plate is made of a transparent material through which the inside of the shield plate is perceived. The shield plate is made of a transparent material having a predetermined diameter and arrangement so as to correspond to the speaker hole of the mobile phone, And a receiving hole is perforated so as to have a predetermined diameter and an arrangement so as to correspond to a transmission hole of the cellular phone at the lower center. The harmful electromagnetic waves emitted from the front keypad unit and the transmitter and receiver of the cellular phone are blocked when the cellular phone is transmitted and received .

However, the method of attaching the blue light shielding film to all of the manufactured electronic devices has been raised a problem of raising the manufacturing cost of the product, and recently, studies have been carried out to add blue light shielding function to the user's glasses or contact lenses . In addition, studies have been actively conducted on adding a blue light blocking function to a contact lens in accordance with recent trends in wearing contact lenses for not wearing glasses or performing cosmetic assist operations such as LASIK.

However, the conventional contact lens having a function of blocking blue light has a drawback that when a colorant comes into direct contact with an eyeball and gives a crowd to the eyeball when worn (Korean Patent Laid-Open No. 10-2009-0036122), a dye made of particles is manufactured to have mobility inside the lens (Korean Patent No. 10-1190303), there was a problem that the blue light blocking effect was low or the dye was eluted. In addition, as disclosed in Korean Patent No. 10-1190303, in the conventional method of manufacturing a contact lens including a colored portion, after the color tone portion is applied to the template, the template is padded onto the silicon pad, There is a problem in that the coloring part is not uniformly formed due to the phenomenon that the colored part is applied to the stream type mold so that the color part is bundled at the edge part of the jig while the coloring part is formed by progressing the polymer polymerization reaction through ultraviolet irradiation.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a blue light shielding thin film in which the hue of the blue light shielding thin film is suppressed, Provided is a method for manufacturing a blue light-blocking contact lens that allows a user to feel comfort without wearing a blue light blocking thin film when worn, so that the wearer can feel comfort without wearing the eyeball when wearing.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art

A first step of forming a first thin film by applying a lens forming composition to a lower mold;

A second step of attaching the blue light shielding thin film to the upper mold;

A third step of bonding the blue light-shielding thin film to the first thin film;

A fourth step of applying the lens forming composition to an upper mold; And

And a fifth step of laminating the lower mold having the first thin film on the upper mold of the fourth step and polymerizing the lens forming composition to form a second thin film. In the blue light blocking part, A method of manufacturing a blocking contact lens can be provided.

In one embodiment, the blue light shielding thin film of the second step may have a thickness of 100 nm to 50 m, and the blue light shielding part may be embedded in the lens.

In one embodiment, the lens forming composition comprises 1 to 7 parts by weight of styrene, 0.1 to 3 parts by weight of a crosslinking agent, and 0.1 to 0.5 parts by weight of an initiator per 100 parts by weight of the monomer mixture. And the blue light blocking part including the weight part is embedded in the lens.

In one embodiment, there is provided a method of manufacturing a blue light blocking contact lens including a blue light blocking part embedded in a lens, including the step of removing the upper mold after the fifth step and processing the surface of the second thin film lens using a cutting lathe .

In one embodiment, it is possible to provide a method of manufacturing a blue light blocking contact lens, wherein the blue light blocking portion includes the step of irradiating ultraviolet light after the first step or after the fifth step.

The present invention also provides a blue light-blocking contact lens in which the blue light blocking part manufactured by any one of the above manufacturing methods is embedded in the lens to solve the above problems.

In one embodiment, the blue light blocking contact lens having a blue light blocking portion having a distance of 2 to 10 mm from the center of the blue light blocking contact lens to the blue light blocking portion is embedded in the lens.

The present invention is capable of suppressing the phenomenon of aggregation of the color tone portion on the stream edge portion of the stream shape during manufacture by the conventional manufacturing process by previously preparing the blue light blocking film.

In addition, since the blue light shielding thin film is formed so as to be embedded in the lens, the blue light shielding thin film does not touch the eyeball when the wearer wears it.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

FIG. 1 is a cross-sectional view of a blue light blocking contact lens in which a blue light blocking part manufactured according to an embodiment of the present invention is embedded.
FIG. 2 is a front view of a blue light blocking contact lens in which a blue light blocking part manufactured according to an embodiment of the present invention is embedded.
FIGS. 3 to 6 illustrate a manufacturing process of a blue light blocking contact lens in which a blue light blocking portion according to an embodiment of the present invention is embedded.

Hereinafter, the present invention will be described in detail with reference to examples. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

As described above, a method of coloring glasses or contact lenses to block the blue light that increases the fatigue of the eyes by applying a strong stimulus to the optic nerve has been employed. However, in the prior art, the coloring agent is directly contacted to the human body, There is a problem that uniform coloring is difficult due to aggregation at the additional jig portion. Accordingly, the inventors of the present invention have made a blue light-shielding thin film in advance, thereby suppressing the phenomenon of aggregation of the hue portion on the edge of the streamlined mold during the manufacturing process and manufacturing the blue light-shielding thin film to be embedded in the lens, The related experiment was repeated to confirm that the barrier membrane could feel comfort by not touching the eyeball directly.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIGS. 3 to 6 illustrate a manufacturing process of a blue light blocking contact lens in which a blue light blocking portion according to an embodiment of the present invention is embedded.

The present invention provides a method for manufacturing a lens, comprising: a first step of forming a first thin film by applying a lens forming composition to a lower mold; A second step of attaching the blue light shielding thin film to the upper mold; A third step of bonding the blue light-shielding thin film to the first thin film; A fourth step of applying the lens forming composition to an upper mold; And a fifth step of laminating the lower mold having the first thin film on the upper mold of the fourth step and polymerizing the lens forming composition to form a second thin film. In the blue light blocking part, A method of manufacturing a contact lens can be provided.

The method may further include irradiating ultraviolet light after the first step and the fifth step. Preferably, ultraviolet light is irradiated for 20 to 70 minutes until the polymerization rate of the lens forming composition reaches 90% You can investigate.

The ultraviolet ray irradiation is for forming the first thin film and the second thin film, and may be performed under anaerobic conditions, and preferably under inert gas conditions such as nitrogen or argon.

Referring to FIG. 3, a first step of forming the first thin film by applying the lens forming composition to the lower mold can be provided.

The composition for forming a lens includes 1 to 7 parts by weight of styrene, 0.1 to 3 parts by weight of a crosslinking agent, and 0.1 to 0.5 parts by weight of an initiator per 100 parts by weight of a monomer mixture Preferably, 1 to 7 parts by weight of styrene can be copolymerized per 100 parts by weight of the monomer mixture, 0.3 parts by weight of a cross-linking agent and 0.1 part by weight of an initiator, respectively.

It is preferable to use a polyester material as the monomer. Many US patents have already disclosed the use of polyester materials for making ophthalmic lenses. Examples of such documents are U.S. Patent Nos. 3,391,224, 3,513,224 and published PCT application WO 93/21010. No. 3,391,224 discloses a composition in which the polyester is blended with 5 to 20% by weight of methyl methacrylate and less than 5% by weight of styrene to produce a thermosetting product that can be used to make ophthalmic lenses. No. 3,513,224 discloses that 70 to 75% by weight of a specific unsaturated polyester formed by reacting fumaric acid with triethylene glycol and 2,2-dimethyl-1,3-propanediol (or known as neopentyl glycol) By weight to 18% by weight of styrene and 8 to 12% by weight of ethylene glycol dimethacrylate. Styrene increases the refractive index to about 1.52, and ethylene glycol dimethacrylate reduces the degree of breakage of the polymer.

The cross-linking agent cross-links the monomer mixture in the composition for forming a lens upon irradiation with ultraviolet rays and contributes to formation of the first thin film and the second thin film. When the cross-linking agent is contained in an amount of less than 0.1 part by weight, If it exceeds 3 parts by weight, the elasticity and water content of the contact lens can be lowered.

It is preferable that the first thin film does not initiate polymer polymerization. The first thin film may be a form coated with a lens forming composition and may be formed by laminating a lower mold having the first thin film attached thereto on an upper mold to which the polymer forming composition is applied in the fifth step It is preferable to initiate the post polymerization.

Referring to FIG. 4, a second step of attaching the blue light shielding thin film to the upper mold and a third step of bonding the blue light shielding thin film to the first thin film may be provided.

The blue light shielding thin film may block transmission of a wavelength of 380 nm to 520 nm which gives a strong stimulus to the optic nerve and the thickness of the blue light shielding thin film may be adjusted according to the refractive index of the contact lens between 100 nm and 50 m. If the thickness of the blue light-shielding thin film is less than 100 nm, the economical efficiency of the manufacturing process may be a problem. If the thickness of the blue light-shielding thin film is more than 50 μm, the contact lens may expand, resulting in a contact lens having different refractive index.

The blue light shielding thin film may be formed in a larger area than the iris region, and the distance from the center of the blue light shielding contact lens to the blue light shielding thin film may be 2 to 10 mm. If the distance to the blue light shielding film is less than 2 mm, it may interfere with the field of view by covering the central transparent region. If it exceeds 10 mm, the blue light shielding film may be excessively wider than the iris region.

The blue light shielding thin film is formed by coloring a blue light blocking pigment to a thin film containing any one selected from the group consisting of polystyrene, polyethylene, polypropylene, and polyvinylchloride or a combination thereof .

Specifically, the blue light blocking pigment may be BPI Filter Vision 450, BPI Diamond Dye 500, or Iron Oxides (Red) 21cfr No. 73.3125, and may be selected from the group consisting of polystyrene, polyethylene, polypropylene, and polyvinyl chloride One or a combination thereof may be immersed in the heated hue complex containing the dye solution containing the blue light blocking dye for a certain period of time to form the blue light shielding thin film.

The blue light-shielding thin film may be formed in a form in which an optical zone (OZ) is removed. The optical zone may be a distance of 2 mm to 10 mm from the center of the blue light blocking film, and the shape of the optical zone is not particularly limited. However, the optical zone may be a circular region of a portion called a pupil, Similar to the pupil shape, it is preferably circular or elliptical.

5, a fourth step of applying the lens forming composition to an upper mold, and a lower mold having the first thin film attached thereto are laminated on the upper mold of the fourth step, and the lens forming composition is polymerized to form a second A fifth step of forming a thin film can be provided.

The lens forming composition used in the fourth step may be the same as the lens forming composition used in the first step, and the kind and content of the composition are the same as described above.

The blue light-shielding thin film may be embedded in the contact lens by polymerizing the lens-forming composition applied in the fourth step by laminating the lower mold having the blue light-shielding thin film on the first thin film on the upper mold, A second thin film can be manufactured in the form of the second thin film, and the shape of the second thin film is as shown in FIG.

Specifically, the lower mold is laminated on the upper mold so that polymerization and bonding of the polymer are performed at a portion where the first thin film and the second thin film contact with each other, and the polymerization reaction proceeds while the viscosity of the polymer increases, The composition for lens formation and the first thin film may form one second thin film.

The present invention can also provide a method of manufacturing a contact lens embedded in a blue light blocking part lens including a step of removing the upper mold after the fifth step and machining the lens surface using a cutting lathe. The surface of the contact lens can be processed using the cutting lathe, and the portion processed by the cutting lathe can be smoothly formed through front surface polishing and edge polishing, and then separated from the lower mold. As a result, as shown in FIGS. 1 and 2 The blue light shielding portion can form a contact lens embedded in the lens.

The present invention can also provide a contact lens embedded in a blue light shielding part lens manufactured by the above manufacturing method.

FIG. 1 is a cross-sectional view of a blue light blocking contact lens embedded in a blue light blocking portion manufactured according to an embodiment of the present invention. FIG. 2 is a cross- And a front view of the contact lens, respectively.

The blue light blocking portion may have a thickness of 100 nm to 50 탆. If the thickness of the blue light-shielding thin film is less than 100 nm, it may be difficult to manufacture due to difficulty in manufacturing. If the thickness is more than 50 μm, the refractive index may be different from the desired one.

The distance from the center of the blue light blocking contact lens to the blue light blocking portion may be 2 mm to 10 mm. If the distance to the blue light shielding film is less than 2 mm, it may interfere with the field of view by covering the central transparent region. If it exceeds 10 mm, the blue light shielding film may be excessively wider than the iris region.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

110 and 210:
120, 220, 420: blue light-shielding thin film
310, 510: polymer for lens formation
330: Upper mold
340: Lower mold
410: first thin film
420: blue light-shielding thin film
610: Second thin film

Claims (7)

A first step of forming a first thin film by applying a lens forming composition to a lower mold;
A second step of attaching the blue light shielding thin film to the upper mold;
A third step of bonding the blue light-shielding thin film to the first thin film;
A fourth step of applying the lens forming composition to an upper mold; And
And a fifth step of laminating the lower mold having the first thin film on the upper mold of the fourth step and polymerizing the composition for lens formation to form a second thin film.
Wherein the blue light blocking part is embedded in the lens.
The method according to claim 1,
Wherein the thickness of the blue light shielding thin film in the second step is 100 nm to 50 占 퐉.
The method according to claim 1,
The composition for forming a lens according to claim 1, wherein the lens forming composition comprises 1 to 7 parts by weight of styrene, 0.1 to 3 parts by weight of a crosslinking agent, and 0.1 to 0.5 parts by weight of an initiator per 100 parts by weight of a monomer. Wherein the contact lens is embedded in the additional lens.
The method according to claim 1,
Further comprising the step of removing the upper mold after the fifth step and processing the lens surface using a cutting lathe, wherein the blue light blocking part is embedded in the lens.
The method according to claim 1,
Wherein the step of irradiating ultraviolet rays after the first step or the step of irradiating ultraviolet rays after the first step or the fifth step is embedded in the lens.
A contact lens in which the blue light shielding part manufactured by the manufacturing method according to any one of claims 1 to 5 is embedded in a lens.
The method according to claim 6,
Wherein the distance between the center of the blue light blocking contact lens and the blue light blocking portion is 2 mm to 10 mm.

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