TWI676836B - Contact lens having pattern - Google Patents

Abstract

The invention discloses a patterned contact lens, which comprises a lens body, a pattern layer and a protective layer. The lens body has a central region and a peripheral region surrounding the central region. The pattern layer and the protective layer are both disposed in the peripheral region, and the pattern layer is covered by the protective layer to be isolated from the outside. The maximum outer diameter of the protective layer satisfies the following conditions: W2 + W2 × 0.1% <W1 <W2 + W2 × 20%, W1 represents the maximum outer diameter of the protective layer, and W2 represents the maximum outer diameter of the pattern layer. This can prevent the eyes of the wearer from directly contacting the pattern layer.

Description

Patterned contact lenses

The invention relates to a contact lens, in particular to a contact lens with a pattern.

After the advent of the information society, the frequent use of 3C products such as smartphones and computers has not only led to a rising rate of myopia among Chinese people, but the age of myopia has also decreased year by year. Considering aesthetics and ease of use, wearing contact lenses is a good choice.

In recent years, the development of contact lenses has added a decorative function from the original basic function of correcting vision, that is, setting specific colors, patterns, or a combination thereof in the lens to achieve the appeal of beautifying the eyes. Many people today have the habit of wearing colored contact lenses for a long time even without myopia. However, the coloring materials used to make colored contact lenses will more or less harm the wearer's eyes.

In addition, during the wearing or cleaning of colored contact lenses, the lens body is often bent repeatedly, causing the contour of the pattern composed of the coloring layer covered in the lens body to be deformed and uneven, and even more serious in the coloring layer. The pigment will fall off and cause damage to the eyes.

The technical problem to be solved by the present invention is to provide a contact lens with a pattern in response to the shortcomings of the prior art, so as to balance the aesthetics and safety of the wearer.

In order to solve the above technical problems, one of the technical solutions adopted by the present invention Yes, a patterned contact lens is provided, which includes a lens body, a pattern layer, and a protective layer. The lens body has a central region and a peripheral region surrounding the central region. The pattern layer is disposed on the peripheral region. The protective layer is disposed on the peripheral region and covers the pattern layer. The pattern layer is isolated from the outside. The maximum outer diameter of the protective layer is W1, and the maximum outer diameter of the pattern layer is W2, which meets the following conditions: W2 + W2 × 0.1% <W1 <W2 + W2 × 20%.

In an embodiment of the present invention, a maximum outer diameter of the protective layer is not less than 6 mm.

In an embodiment of the present invention, the pattern layer includes a plurality of color layers with different colors, and the plurality of color layers are separated from each other to form a predetermined pattern.

In an embodiment of the present invention, the pattern layer includes a plurality of color layers with different colors, and the plurality of color layers are stacked to form a predetermined pattern.

In an embodiment of the present invention, the plurality of color layers are a first color layer and a second color layer, the first color layer has a first color mixing area, and the A part is stacked on the first color mixing area.

In an embodiment of the present invention, the plurality of color layers are a first color layer, a second color layer, and a third color layer, respectively, and the first color layer has an adjacent first mixed color region. And a second color mixing region, a part of the second color layer is stacked on the first color mixing region, and a part of the third color layer is stacked on the second color mixing region.

In an embodiment of the present invention, a projection area of the central area is 15% to 25% of a total area of the lens body.

In an embodiment of the invention, a projection area of the peripheral area is 75% to 85% of a total area of the lens body.

In an embodiment of the present invention, an outer surface of the lens body has a recessed recessed space, and the protective layer and the pattern layer are both contained in the recessed space.

In an embodiment of the present invention, the protective layer includes a film-forming polymer, a hydrophilic polymer, and a solvent. Based on the total weight of the protective layer, the content of the film-forming polymer is intermediary. The content of the hydrophilic polymer is between 15% and 50%, and the content of the solvent is between 30% and 90%.

One of the beneficial effects of the present invention is that the patterned contact lens provided by the present invention can cover the pattern layer with a protective layer to isolate it from the outside, and the maximum outer diameters of the protective layer and the pattern layer satisfy specific conditions. Technical solution to make the pattern layer stably display the predetermined decorative effect in the lens body, and the pattern outline in the pattern layer will not be deformed by the lens body's extrusion, and the coloring material in the pattern layer will not be exposed, or even Falling off and hurting the wearer's eyes.

In order to further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are only for reference and description, and are not intended to limit the present invention.

L‧‧‧ Contact lenses with pattern

1‧‧‧ lens body

101‧‧‧Inner surface

102‧‧‧outer surface

C‧‧‧Central area

P‧‧‧surrounding area

2‧‧‧ pattern layer

21‧‧‧The first gentle slope structure

22‧‧‧ Color Layer

22a‧‧‧first color layer

22a1‧‧‧first mixed color area

22a2‧‧‧Second color mixing area

22b‧‧‧Second Color Layer

22c‧‧‧The third color layer

W2‧‧‧ Maximum outer diameter

2’‧‧‧ colloid layer

3‧‧‧ protective layer

31‧‧‧Second gentle slope structure

W1‧‧‧ Maximum outer diameter

3’‧‧‧ colloid layer

4‧‧‧The first mold

400‧‧‧ Shaped Noodle

5‧‧‧ rubber head

6‧‧‧Template

61‧‧‧patterned groove

7‧‧‧Second Mould

700‧‧‧ Shaped Noodle

FIG. 1 is a schematic cross-sectional view of a patterned contact lens according to the present invention.

FIG. 2 is an enlarged schematic view of part II in FIG. 1.

FIG. 3 is a schematic top view of a patterned contact lens according to the present invention.

FIG. 4 is another enlarged schematic view of part II in FIG. 1, which shows a first embodiment of a pattern layer in a patterned contact lens according to the present invention.

FIG. 5 is a further enlarged schematic view of part II in FIG. 1, which shows a second embodiment of a pattern layer in a patterned contact lens according to the present invention.

FIG. 6 is another enlarged schematic diagram of part II in FIG. 1, which shows a third embodiment of a pattern layer in a patterned contact lens according to the present invention.

7 to 10 are schematic diagrams of a manufacturing process in a patterned contact lens according to the present invention.

The following is a description of the implementation of the "contact lens with a pattern" disclosed in the present invention through specific specific examples. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be based on different viewpoints and applications, and various modifications and changes can be made without departing from the concept of the present invention. In addition, the drawings of the present invention are merely a schematic illustration, and are not drawn according to actual dimensions, and are stated in advance. The following embodiments will further describe the related technical content of the present invention in detail, but the disclosed content is not intended to limit the protection scope of the present invention.

It should be understood that although the terms “first,” “second,” and “third” may be used herein to describe various elements or signals, these elements or signals should not be limited by these terms. These terms are mainly used to distinguish one element from another element, or a signal from another signal. In addition, the term "or" as used herein should, depending on the actual situation, include any one or more of the associated listed items.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. When a term appears in the singular, the plural of the term is encompassed. The laboratory procedures used in this article are well known and commonly used in the art, and the methods used in these procedures are provided in the general references.

Unless otherwise indicated, all percentages mentioned herein are weight percentages. When a range of upper and lower limits is provided, all combinations of the mentioned ranges are covered as if the combinations were explicitly listed.

Please refer to FIG. 1 to FIG. 3, an embodiment of the present invention provides a patterned contact lens L, which is a sandwich structure and includes a lens body 1, a pattern layer 2 and a protective layer 3. The lens body 1 has a central region C and a peripheral region P surrounding the central region C. The central region C corresponds to the pupil position of the eye and the peripheral region P corresponds to the iris position of the eye. The pattern layer 2 is disposed on the peripheral region P, and the protective layer 3 is disposed on the periphery. The side region P covers the pattern layer 2 to isolate the pattern layer 2 from the outside. In this embodiment, the projected area of the central area C is 15% to 25% of the total area of the lens body, and the projected area of the peripheral area P is 75% to 85% of the total area of the lens body 1.

The lens body 1 may be a light-transmitting body, and has an inner surface 101 for contacting a wearer's eyeball surface and an outer surface 102 opposite to the inner surface 101, wherein the inner surface 101 is a concave surface, and The outer surface 102 is a convex surface. In this embodiment, the material of the lens body 1 may be a silicone hydrogel or a hydrogel, and may be molded at one time by a molding method, but the present invention is not limited thereto.

Further, the silicone hydrogel can improve the oxygen permeability of the lens body 1, thereby avoiding the situation of corneal hypoxia. Suitable silicone gels can be materials classified by the US Food and Drug Administration (FDA) into Group 5, including: Balafilcon A, Comfilcon A, Efrofilcon A, Enfilcon A, Galyfilcon A, Lotrafilcon A, Lotrafilcon B, Narafilcon A, Narafilcon B, Senofilcon A, Delefilcon A, and Somofilcon A. If necessary, other beneficial ingredients can be added to the silicone lens body 1 such as blue light and UV absorber.

In addition, the hydrogel can improve the wettability and surface lubricity of the lens body 1, thereby improving wearing comfort. Suitable hydrogels can be nonionic polymers with low water content (water content less than 50% by weight) classified by the FDA as Group 1, including: Helfilcon A & B, Hioxifilcon B, Mafilcon, Polymacon, Tefilcon and Tetrafilcon A. Suitable hydrogels can also be non-ionic polymers with high water content (water content greater than 50% by weight) classified by the FDA to Group 2, including: Acofilcon A, Alfafilcon A, Hilafilcon B, Hioxifilcon A, Hioxifilcon B. Hioxifilcon D, Nelfilcon A, Nesofilcon A, Omafilcon A, and Samfilcon A. Suitable hydrogels can also be ionic polymers with low water content (water content less than 50% by weight) classified by the FDA as Group 3, including Deltafilcon A and the like. Suitable hydrogels can also be ionic polymers with high water content (water content greater than 50% by weight) classified by the FDA to Group 4, including: Etafilcon A, Focofilcon A, Methafilcon A, Methafilcon B, Ocufilcon A, Ocufilcon B, Ocufilcon C, Ocufilcon D, Ocufilcon E, Phemfilcon A, and Vifilcon A.

The pattern layer 2 and the protective layer 3 can be formed by pad printing. The protective layer 3 is disposed in the lens body 1 near the outer surface 102, the pattern layer 2 is disposed between the protective layer 3 and the lens body 1, and the pattern layer 2 Because it is covered by the protective layer 3 and the lens body 1, it is isolated from the outside. In this embodiment, the outer surface 102 of the lens body 1 has a recessed space, and the pattern layer 2 and the protective layer 3 are both accommodated in the recessed space. The pattern layer 2 is perpendicular to the inner surface 101 of the lens body 1. The distance d may be between 5 micrometers (μm) and 100 micrometers (μm). The pattern layer 2 has a first gentle-slope structure 21 whose maximum tangent angle is between 10 degrees and 80 degrees. The protective layer 3 has a second gentle-slope structure 31 whose maximum tangent angle is between 5 degrees and 45 degrees.

It is worth noting that the protective layer 3 has a maximum outer diameter W1, the pattern layer 2 has a maximum outer diameter W2, the maximum outer diameter W1 of the protective layer 3 is not less than 6 millimeters (mm), and satisfies the following conditions: W2 + W2 × 0.1% <W1 <W2 + W2 × 20%. According to this, the patterned contact lens L of the present invention can meet the general use needs, and the protective layer 3 and the patterned layer 2 have a certain bonding force, which can prevent the color material in the patterned layer 2 from diffusing outward. Touch the eyes of the wearer. In addition, the protective layer 3 can provide good support for the pattern layer 2, and therefore, the pattern outline in the pattern layer 2 will not be deformed by the lens body 1 being squeezed, that is, the pattern layer 2 can be stabilized in the lens body 1 A predetermined decorative effect is displayed.

Further, the pattern layer 2 may have a pattern of a single color or a plurality of colors. Taking a pattern of multiple colors as an example, as shown in FIG. 4, the pattern layer 2 may include a plurality of color layers 22 of different colors, and the plurality of color layers 22 are separated from each other to form a predetermined pattern; or, as shown in FIGS. 5 and 6 As shown, a plurality of color layers 22 are stacked to form a predetermined pattern. The composition of the pattern layer 2 is not the focus of the present invention, so it will not be described in detail here. In practice, the composition of the pattern layer 2 may include a polymer material, a colorant, and a dispersant, but the present invention is not limited thereto.

In this embodiment, the plurality of color layers 22 may be a first color layer 22a and A second color layer 22b, the first color layer 22a has a first color mixing region 22a1, and a part of the second color layer 22b is stacked on the first color mixing region 22a1. The multiple color layers may also be a first color layer 22a, a second color layer 22b, and a third color layer 22c. The first color layer 22a has a first color mixing area 22a1 and a second color mixing area 22a2. A part of the two color layers 22b is stacked on the first color mixing region 22a1, and a part of the third color layer 22c is stacked on the second color mixing region 22a2.

The protective layer 3 is formed by mixing specific composition components according to a specific ratio. The protective layer 3 has good mechanical properties, appropriate viscosity and affinity, and has good compatibility with the pattern layer 2. According to this, the protective layer 3 is not easy to be damaged during the manufacturing process of the contact lens, and this helps the pattern layer 2 be more stably covered in the lens body 1; the protective layer 3 also has good processability, which is After molding, it can be easily transferred into the mold.

Furthermore, the protective layer 3 includes a film-forming polymer, a hydrophilic polymer, and a solvent. The film-forming polymer is selected from the group consisting of polyether polyol, polyether, polyester polyols, polyacrylic acid and its derivatives, and polymethylmethacrylate. One or a combination of two or more of its derivatives and styrene-acrylic acid copolymers.

For example, the polyether polyol may have a molecular weight between 5000 and 500,000, which may use polyethylene glycol, polypropylene glycol, glycerin, caprolactone, or the like And any combination. The polyether may have a molecular weight between 5,000 and 500,000, and it may use any combination of ethylene oxide, propylene oxide, glycerin, or the like. As the polyester polyol, oxalic acid, malonic acid, glycerin, or any combination thereof can be used. Polyacrylic acid may have a molecular weight between 5,000 and 1.5 million. As the polyacrylic acid derivative, polyacrylic acid salts such as potassium salt and sodium salt of acrylic acid can be used. Polymethyl methacrylate can have a molecular weight between 5,000 and 500,000. Copolymers of styrene and acrylic acid can be formed using 10-90% styrene monomer and 90-10% acrylic acid.

Based on the total weight of the protective layer 3, the content of the film-forming polymer is between 1 and 60%, preferably between 15 and 50%. If the content of the film-forming polymer is less than 1%, the viscosity characteristics of the protective layer 3 will be adversely affected and cannot be fixed to a specific position in the lens body 1. If the content of the film-forming polymer is more than 60%, the protection Layer 3 can adversely affect the contact lens manufacturing process because of its high viscosity.

The hydrophilic polymer is selected from the group consisting of polyvinyl alcohol, cellulose and its derivatives, polyethylene alcohol, and polyvinylpyrrolidone and its copolymers. copolymer). For example, polyvinyl alcohol can be a polymer with a degree of polymerization between 500 and 10,000. Cellulose can have a molecular weight between 5,000 and 500,000. Polyethylene glycol can have a molecular weight between 5 and 500,000. Polyvinylpyrrolidone may have a molecular weight between 5,000 and 1.5 million.

Based on the total weight of the protective layer 3, the content of the hydrophilic polymer is between 0.1 and 45%, preferably between 5 and 40%. If the content of the hydrophilic polymer is less than 1%, the viscosity characteristics of the protective layer 3 will be adversely affected and cannot be fixed at a specific position in the lens body 1. If the content of the hydrophilic polymer is more than 45%, the protective layer 3 It will adversely affect the contact lens manufacturing process because of its high viscosity. In addition, the content of hydrophilic polymers will also affect the wearing comfort of contact lenses.

The solvent is one or a combination of two or more selected from water, alcohols, and amidines. Specific examples of the solvent include ethanol, propanol, N-methylpyrrolidone, dimethylacetamide, and dimethylformamide. The content of the solvent is between 30 and 90% based on the total weight of the protective layer 3.

Table 1 below lists a number of experimental examples of the protective layer 3, each of which has a different composition and dosage ratio. The following Table 1 also lists the evaluation results for these experimental examples and specific comparative examples, where ◎ represents good results in film formation / phase transfer, △ represents satisfactory results in film formation / phase transfer, and × represents film formation / phase transfer Is not performing well. It can be seen from Table 1 that the protective layer formed by using specific composition components and mixing in a specific proportion 3. An acceptable film-forming / phase-transfer effect can be obtained. In addition, the content of the solvent in Comparative Example 1 is less than 30%, the content of the film-forming polymer in Comparative Example 2 is greater than 60%, and the content of the hydrophilic polymer in Comparative Example 3 is greater than 45%, neither of Comparative Examples 1 to 3 is possible. Obtain good film formation / phase transfer effect.

Please refer to FIG. 7 to FIG. 10, the detailed features of the patterned contact lens L according to the present invention have been described in detail above, and the manufacturing method thereof will be further described below. As shown in FIG. 7, this manufacturing method first provides a first mold 4, which may be a mother mold. In this embodiment, the material of the first mold 4 may be metal or plastic, but the present invention is not limited thereto.

Next, as shown in FIG. 7, the material of the protective layer 3 is dipped with the rubber head 5, and the material is waited for a period of time to form a colloidal layer 3 ′ on the rubber head 5, and then an appropriate pressure such as 0.1 psig to 2.0 psig transfers this colloidal layer 3 ′ onto the shaping surface 400 of the first mold 4 to form a protective layer 3, and the protective layer 3 has a second gentle slope structure 31. Then, as shown in FIG. 8 and FIG. 9, the material of the pattern layer 2 is filled into the patterned groove 61 of the template 6, and waits for a period of time, so that this material forms another colloidal layer in the patterned groove 61. After 2 ', the colloidal layer 2' is printed on the surface of the protective layer 3 with an appropriate pressure, such as 0.1 psig to 2.0 psig. After curing, the pattern layer 2 is formed, and the pattern layer 2 has a first gentle slope structure 21 . In this embodiment, the template 6 may be a steel plate, and the patterned groove 61 thereof may be formed by laser engraving, but the present invention is not limited thereto. For example, in other embodiments, the template 6 may be made of other metal materials, and the patterned groove 61 may be formed by chemical etching. In addition, if the pattern layer 2 uses more than one color, that is, the pattern layer 2 includes a plurality of color layers 22, it may be necessary to perform multiple printing steps with more than one template 6.

Finally, as shown in FIG. 10, the material of the lens body 1 is injected into the first mold 4, and then a second mold 7 is used to close the first mold 4, that is, the second mold 7 is pressed onto the first mold 4. Then, the material is cured under the action of ultraviolet light (UV) or heat to form a lens body 1 covering the pattern layer 2 and the protective layer 3. When the first mold 4 and the second mold 7 are closed, the shape of the lens body 1 can be defined, wherein the shaping surface 400 defines the outer surface 102 of the lens body 1, and the shaping surface 700 defines the inner surface of the lens body 1. Surface 101. In this embodiment, the second mold 7 may be a male mold, and the material of the second mold 7 may be metal or plastic, but the present invention is not limited thereto.

[Advantageous Effects of the Embodiment]

One of the beneficial effects of the present invention is that the patterned contact lens provided by the present invention can cover the pattern layer with a protective layer to isolate it from the outside, and the maximum outer diameters of the protective layer and the pattern layer satisfy specific conditions. Technical solution to make the pattern layer stably display the predetermined decorative effect in the lens body, and the pattern outline in the pattern layer will not be deformed by the lens body's extrusion, and the coloring material in the pattern layer will not be exposed, or even Falling off and hurting the wearer's eyes.

Furthermore, because the protective layer is formed by mixing specific composition components in a specific ratio, it has good mechanical properties, appropriate viscosity and affinity, and has good compatibility with the pattern layer. According to this, the protective layer is not easy to be broken during the manufacturing process of the contact lens, and this helps the pattern layer be more stably covered in the lens body; the protective layer has good processability, which is easy after molding It is transferred into the mold.

The contents disclosed above are only the preferred and feasible embodiments of the present invention, and therefore do not limit the scope of patent application of the present invention. Therefore, any equivalent technical changes made by using the description and drawings of the present invention are included in the application of the present invention Within the scope of the patent.

Claims (10)

A patterned contact lens includes: a lens body having a central region and a peripheral region surrounding the central region; a pattern layer disposed on the peripheral region; and a protective layer disposed on The peripheral area covers the pattern layer to isolate the pattern layer from the outside. The maximum outer diameter of the protective layer is W1, and the maximum outer diameter of the pattern layer is W2, which meets the following conditions: W2 + W2 × 0.1% <W1 <W2 + W2 × 20%; wherein the pattern layer includes a plurality of color layers with different colors, and the plurality of color layers are stacked to form a predetermined pattern. The patterned contact lens according to claim 1, wherein the maximum outer diameter of the protective layer is not less than 6 mm. The patterned contact lens according to claim 1, wherein the plurality of color layers are a first color layer and a second color layer, the first color layer has a first color mixing area, and A part of the second color layer is stacked on the first color mixing area. The patterned contact lens according to claim 1, wherein the plurality of color layers are a first color layer, a second color layer, and a third color layer, respectively, and the first color layer has an adjacent A first color mixing region and a second color mixing region, a portion of the second color layer is stacked on the first color mixing region, and a portion of the third color layer is stacked on the second color mixing region. The patterned contact lens according to claim 1, wherein a projection area of the central region is 15% to 25% of a total area of the lens body. The patterned contact lens according to claim 1, wherein a projection area of the peripheral area is 75% to 85% of a total area of the lens body. The patterned contact lens according to claim 1, wherein an outer surface of the lens body has a recessed space, and the protective layer and the pattern layer are both contained in the recessed space. The patterned contact lens according to claim 1, wherein the protective layer includes a film-forming polymer, a hydrophilic polymer, and a solvent, and the film-forming property is based on the total weight of the protective layer. The content of the polymer is between 15% and 50%, the content of the hydrophilic polymer is between 5% and 40%, and the content of the solvent is between 30% and 90%. A patterned contact lens includes: a lens body having a central region and a peripheral region surrounding the central region; a pattern layer disposed on the peripheral region; and a protective layer disposed on The peripheral area covers the pattern layer to isolate the pattern layer from the outside. The maximum outer diameter of the protective layer is W1, and the maximum outer diameter of the pattern layer is W2, which meets the following conditions: W2 + W2 × 0.1% <W1 <W2 + W2 × 20%; wherein the pattern layer includes a plurality of color layers with different colors, and the plurality of color layers are separated from each other to form a predetermined pattern. A patterned contact lens includes: a lens body having a central region and a peripheral region surrounding the central region; a pattern layer disposed on the peripheral region; and a protective layer disposed on The peripheral area covers the pattern layer to isolate the pattern layer from the outside. The maximum outer diameter of the protective layer is W1, and the maximum outer diameter of the pattern layer is W2, which meets the following conditions: W2 + W2 × 0.1% <W1 <W2 + W2 × 20%; wherein the protective layer includes a film-forming polymer, a hydrophilic polymer, and a solvent. Based on the total weight of the protective layer, the The content of the film-forming polymer is between 15% and 50%, the content of the hydrophilic polymer is between 5% and 40%, and the content of the solvent is between 30% and 90%. between.