JP2020008872A - Colored contact lens - Google Patents

Abstract

To provide a colored contact lens expressing an iris part (a black eye part) of a wearer in a natural mode, even when there is deviation between an eye ball and the colored contact lens caused by movement of an eye of the wearer, capable of preventing a scleral section from being viewed, and having a natural external appearance.SOLUTION: The colored contact lens includes: a rimming colored part 4 that is an annular colored region having colored dots of a first color corresponding to the color of the iris part of a wearer and disposed at a position of rimming the outer shape of the iris part; and a transition colored part 6 that is an annular colored region having colored dots and is disposed adjacent to the inner side of the rimming colored part. The color density of the transition colored part 6 is so distributed as to decrease from the outside toward the inside in the radial direction, and the color density is changed by changing the density of the colored dots, so that, when the density of the colored dots is expressed by a ratio of an area of the colored dots with respect to an area of the whole region where the colored dots are disposed, the density of the colored dots near the outside end of the transition colored part 6 is defined as within 50-80%.SELECTED DRAWING: Figure 6B

Description

  The present invention relates to a color contact lens that can change the color of the iris of a wearer.

  2. Description of the Related Art In recent years, color contact lenses that can change the color of the iris (the iris portion) of a wearer have become popular mainly among young women. Among them, there has been proposed a color contact lens having an annular colored band on the contour of the iris of the wearer. In such a color contact lens, the outline of the iris portion can be sharpened sharply by the colored band, but on the contrary, there arises a problem of giving an artificial impression.

  In order to cope with this, there is an annular colored band extending over the boundary line between the iris portion and the sclera portion (white-eye portion) and extending from the inner peripheral side to the outer peripheral side in the colored band. There has been proposed a color contact lens which is colored so that the color density decreases (for example, see Patent Document 1). The color contact lens described in Patent Literature 1 has a color in which the color density decreases from the inner peripheral side toward the outer peripheral side in the outer region of the iris portion, so that a more natural and warm appearance can be provided.

Japanese Patent No. 5689900

  When the color contact lens is worn, the end of the color contact lens is restrained by the upper and lower eyelids, so that when the wearer moves his eyes, a gap usually occurs between the eyeball and the color contact lens. In the color contact lens described in Patent Literature 1, since the same color as the colored band is not applied inside the colored band, the sclera portion (white-eye portion) located outside the iris portion is colored due to this shift. If it is shifted inside the band, it will be visible from the outside and will have an unnatural appearance. In particular, when the width of the colored band in the radial direction is reduced in order to obtain a natural appearance of the iris portion when the color contact lens is worn, the sclera portion (white-eye portion) is easily exposed.

  The present disclosure has been made in view of the above-described problem, and can clearly show the iris part (the iris part) of the wearer in a natural manner, and can also use the eyeball and the color due to the movement of the eye of the wearer. It is an object of the present invention to provide a color contact lens that can prevent a sclera portion from being visually recognized and has a natural appearance even when a gap occurs between contact lenses.

In order to solve the above problems, in the color contact lens according to one embodiment of the present invention,
An annular colored region having a colored dot of the first color in the color of the iris of the wearer, and a border coloring portion arranged at a position bordering the outer shape of the iris;
A transition coloring portion which is an annular coloring region having coloring dots, is disposed adjacent to the inside of the border coloring portion, and connects the border coloring portion and a further inner region.
With
The density of the colored dots of the border coloring portion is within a certain range,
The density of the colored dots in the transition colored portion is distributed in the radial direction so as to decrease from the outside to the inside in the radial direction.

  As described above, in the present disclosure, the iris portion of the wearer can be clearly and clearly shown in a natural manner by the border coloring portion, and is disposed inside the border coloring portion, and the density of the colored dots proceeds from the outside to the inside. The transition coloring portion, which decreases as a result, can prevent the sclera portion (white-eye portion) from being visually recognized even if a shift occurs between the eyeball and the color contact lens due to the movement of the eye of the wearer. In addition, a color contact lens having a natural appearance can be provided.

It is a top view showing typically a color contact lens concerning one embodiment of the present invention. FIG. 2 is a plan view schematically showing a border coloring portion of the color contact lens shown in FIG. 1. It is a top view which shows typically the transition coloring part of the color contact lens shown in FIG. FIG. 2 is a side sectional view schematically showing a state where a color contact lens is mounted. It is a side sectional view showing typically the case where a conventional color contact lens is worn, and is a figure showing the case where the wearer is looking at the front. FIG. 5B is a side cross-sectional view schematically illustrating a case where a conventional color contact lens is mounted, and illustrates a case where the eye is moved from the case illustrated in FIG. 5A. FIG. 2 is a side sectional view schematically illustrating a case where the color contact lens illustrated in FIG. 1 is worn, and is a diagram illustrating a case where a wearer is looking at the front. FIG. 6B is a side cross-sectional view schematically illustrating a case where the color contact lens illustrated in FIG. 1 is mounted, and illustrates a case where the eye is moved from the case illustrated in FIG. 6A. FIG. 2 is a plan view schematically showing a border coloring portion, a transition coloring portion, and an outer transition coloring portion of the color contact lens shown in FIG. 1. FIG. 8 is a graph showing an example of a distribution of coloring density in a border coloring portion, a transition coloring portion, and an outer transition coloring portion shown in FIG. 7. 8 is a graph showing another example of the distribution of the coloring density in the border coloring portion, the transition coloring portion, and the outer transition coloring portion shown in FIG. 7. FIG. 10 is a diagram (photograph) showing a comparative example using a conventional color contact lens, showing a case where a wearer looks at the front. FIG. 10 is a diagram (photograph) showing a comparative example using a conventional color contact lens, showing a case where a wearer looks at the left side. FIG. 10 is a diagram (photograph) showing a comparative example using a conventional color contact lens, showing a case where a wearer looks at the right side. FIG. 10 is a diagram (photograph) showing a comparative example using a conventional color contact lens, showing a case where a wearer looks upward. FIG. 10 is a diagram (photograph) showing a comparative example using a conventional color contact lens, showing a case where a wearer looks at a lower side. It is a figure (photograph) showing an example by a color contact lens of the present invention, and is a figure showing the case where a wearer looked at the front. It is a figure (photograph) showing an example by a color contact lens of the present invention, and is a figure showing the case where a wearer looked at the left side. It is a figure (photograph) showing an example by a color contact lens of the present invention, and is a figure showing the case where a wearer looked at the right side. It is a figure (photograph) showing an example by a color contact lens of the present invention, and is a figure showing the case where a wearer looked up. It is a figure (photograph) showing an example by a color contact lens of the present invention, and is a figure showing the case where a wearer looked down.

Hereinafter, embodiments and examples for carrying out the present invention will be described with reference to the drawings. Note that the color contact lens described below is for embodying the technical idea of the present invention, and the present invention is not limited to the following unless otherwise specified.
In the drawings, members having the same function may be denoted by the same reference numerals. In consideration of the explanation of the main points or the easiness of understanding, there is a case where the configuration is divided into the embodiments and the examples for the sake of convenience. In the following embodiments and examples, description of matters common to the above will be omitted, and only different points will be described. In particular, the same function and effect of the same configuration will not be sequentially described for each embodiment or example. The size, positional relationship, and the like of the members shown in each drawing may be exaggerated for clarity of description.

(Color contact lens according to one embodiment)
First, a color contact lens according to one embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a plan view schematically showing a color contact lens according to one embodiment of the present invention. FIG. 2 is a plan view schematically showing a border coloring portion of the color contact lens shown in FIG. FIG. 3 is a plan view schematically showing a transition coloring portion of the color contact lens shown in FIG. In FIG. 1, an arc is shown at the boundary position of each colored portion, but this is a line added to clearly show the boundary, and is not drawn on the actual color contact lens 2.

  The color contact lens 2 according to the present embodiment is formed by giving a prescription soft contact lens or a prescription soft contact lens various colors. As a material of the soft contact lens, a gel synthetic polymer compound (hydrogel or the like) such as Poly-HEMA (polyhydroxyethyl methacrylate) or PVP (polyvinyl pyrrolidone) can be used. However, the material is not limited to this, and any other soft contact lens material can be adopted.

The color contact lens 2 is provided with a border coloring portion 4 which is an annular coloring region arranged at a position bordering the outer shape of the iris portion (iris portion) of the wearer. The border coloring section 4 has colored dots of the first color corresponding to the color of the iris of the wearer. This first color may be referred to as a border-corresponding color or a contour-corresponding color.
Further, adjacent to the inside of the border coloring portion 4, a transition coloring portion 6, which is an annular coloring region, is arranged. The transition coloring section 6 has a function of a transition area connecting the border coloring section 6 and a further inner area. In the present embodiment, another colored portion 10 having colored dots of a second color different from the first color is arranged in a region inside the transition colored portion 6.

  The transition coloring section 6 can also have a coloring dot of the first color similarly to the border coloring section 4. In this case, from the border coloring section 4 to the transition coloring section 6, the border coloring section 4 having a border effect can be gradually faded out. In addition, the transition coloring section 6 may have colored dots of a color different from the first color. For example, the color of the transition coloring section 6 may be a color lower in tone than the color of the border coloring section 4. In this case, a more natural appearance can be obtained from the border coloring section 4 to the transition coloring section 6.

  The outline coloring section 4 allows the outline of the iris to be clearly shown or enlarged, and the other coloring sections 10 allow the iris to appear bright or change the color. Furthermore, the transition coloring portion 6 can connect the border coloring portion 4 and the other coloring portions 10 in a natural manner.

<Border coloring part 4>
The first color corresponding to the color of the iris of the wearer is preferably a color that is similar to the color of the iris in order to provide an effect of making the outer shape of the iris of the wearer stand out. In addition, a color slightly darker than the color of the iris part may be used in order to make the outer shape of the iris part stand out clearly. However, the first color is not limited to this, and for example, any other color for exhibiting a design effect on the color of the iris portion can be adopted.

For example, when the color of the iris is dark brown, it is conceivable to use black or a color close to black as the first color. The first color may have a certain hue width in a range that the wearer recognizes as substantially the same color.
Regarding the coloring density of the border coloring section 4, the coloring density of the border coloring section 4 by the colored dots of the first color falls within a certain range. Here, the term “within a certain range” means a range in which the wearer has a perception that coloring is substantially the same.

  The outline of the iris part of the wearer can be clearly shown by the border coloring part 4. In particular, when the width of the border coloring portion 4 in the radial direction is relatively narrow, the iris of the wearer can be clearly displayed in a natural manner. In addition, by arranging the outer end portion of the border coloring portion 4 slightly outside the outer end portion of the iris portion of the wearer, an effect of making the pupil appear large can be achieved.

<Transition coloring section 6>
In the present embodiment, the colored dots of the first color are also arranged in the transition colored section 6. However, the color of the colored dots arranged in the transition coloring section 6 may not be exactly the same as the color of the colored dots arranged in the border coloring section 4 within the above-mentioned fixed range of hue. Furthermore, it is possible to have colored dots of a color different from the first color.

  In the transition coloring section 6 according to the present embodiment, as shown in FIG. 3, the coloring density of the coloring dots is distributed in the radial direction R so as to decrease from the outside to the inside. The coloring density of the colored dots is substantially the same in the circumferential direction. A person's iris gradually changes in coloring density and hue. Thus, similarly, by gradually decreasing the coloring density from the near coloring density of the border coloring portion 4, the outer border coloring portion 4 and the other inside coloring portion 10 can be connected with a natural appearance. it can. In order to obtain such a natural appearance, the width of the transition coloring portion 6 in the radial direction R is preferably larger than the width of the border coloring portion 4 in the radial direction.

  When coloring similar to the border coloring portion 4 and the transition coloring portion 6 is performed, the border coloring portion 4 includes a region in which the coloring density is within a certain range and a radial direction R adjacent to the inside of the region. And a region distributed so that the coloring density decreases as going from the outside to the inside. The other effects of the transition coloring section 6 will be described later in detail with reference to FIGS. 6A and 6B.

<Other colored part 10>
As shown in FIG. 1, another colored portion 10 having colored dots of a second color different from the first color is arranged inside the transition colored portion 6. By using a second color different from the first color that is lighter than the first color, the iris can appear bright. It is also possible to change the color of the iris.

For example, when the first color is dark brown, light brown, yellow, and red, blue, green, and gray colors can be used. However, the color is not limited to this, and any other color can be adopted according to the application or design. As the second color, not only one color but also a plurality of colors can be used. Further, the other colored portion 10 may have a colored dot of the first color. In this case, the same color may be changed by changing the brightness or the saturation.
In the other colored portions 10, not only the case where the same colored dot pattern is provided in the circumferential direction, but also an arbitrary pattern including a pattern that matches the iris and a pattern that enhances the design of the color contact itself can be drawn. .

In more detail, in the present embodiment, the arrangement area of the other coloring sections 10 is arranged not only in the area inside the transition coloring section 6 but also in the border coloring section 4 and the transition coloring section 6. Thereby, the hue and the coloring density can be gradually changed from the border coloring portion 4 toward the inside. However, the present invention is not limited to this, and the arrangement region of the other colored portions 10 may be arranged in the transition colored portion 6 and the region inside the transition colored portion 6, or only in the region inside the transition colored portion 6. It may be located.
In other words, it can be said that another colored portion 10 having colored dots is arranged at least inside the transition colored portion 6.

  In the present embodiment, the coloring density of the other coloring portions 10 is distributed in the radial direction R so as to decrease from the outside to the inside. A person's iris gradually changes in coloring density and hue. Similarly, by decreasing the coloring density from the outside to the inside, a natural beautiful appearance can be obtained.

<Outer transition coloring section 8>
As shown in FIG. 1, in the color contact 2 according to the present embodiment, an outer transition coloring portion 8 which is an annular coloring region is arranged adjacent to the outside of the border coloring portion 4. The transition coloring section 6 also has a coloring dot of the first color. However, the present invention is not limited to this, and may have colored dots of a color different from the first color.

The coloring density of the outer transition coloring portion 8 is distributed in the radial direction R so as to decrease from the inside to the outside. The human eyeball gradually changes from the iris to the sclera (white-eye portion). Similarly, in the outer region of the iris, the density of the colored dots is reduced from the inside to the outside, and thus the nature of the eyeball is gradually increased. Appearance can be obtained.
Since the iris and the sclera part (white-eye part) have considerably different hues, it is preferable that the width of the outer transition coloring part 8 is not too large. Therefore, as is apparent from FIG. 1, it is preferable that the width of the transition colored portion 6 in the radial direction R is larger than the width of the outer transition colored portion 8 in the radial direction R.

Here, each colored region of the border coloring portion 4, the transition coloring portion 6, the outer transition coloring portion 8, and the other coloring portion 10 is colored by coloring dots.
In a color contact lens colored with colored dots, the coloring density can be changed by changing the density of the colored dots. In this case, using colored dots of the same size, by changing the number of colored dots per unit area, the density of the colored dots can be changed, and the size of the colored dots themselves can be changed. Thus, the density of the colored dots can be changed. Furthermore, by using these together, the density of the colored dots can be changed.

As described above, by changing the density of the colored dots, the coloring density can be reliably and easily changed. The density of the colored dots can be represented by, for example, the ratio of the area of the colored dots to the area of the entire region where the colored dots are arranged. In order to obtain a natural appearance, the diameter of each colored dot is preferably about 5 to 200 μm.
Note that, in addition to changing the color density by changing the density of the color dots, the color density can be changed by using color dots having different color densities. As a result, it is possible to represent a subtle change in the coloring density, which is difficult to represent only by a change in the density of the colored dots.

As a method of providing colored dots in each colored area, pad printing can be exemplified. In pad printing, a pad having a dot pattern with ink is pressed against a contact lens and transferred. At this time, after the colored dot pattern is transferred to one surface of the contact lens, the printed surface is covered with the same material of the contact lens to form a color contact lens having a sandwich structure. The surface on which printing is performed may be a surface located outside or a surface located inside when mounted.
However, the present invention is not limited to this, and the printing surface having the colored dot pattern may be exposed to the outside. Further, any other printing method such as ink jet printing can be employed, and a color contact lens can be molded by dissolving a coloring material in a material.

(Problems with conventional color contact lenses)
Next, with reference to FIG. 4, FIG. 5A and FIG. 5B, a problem that occurs in a conventional color contact lens when a wearer moves his or her eyes will be described. FIG. 4 is a side sectional view schematically showing a state when a color contact lens is mounted. FIG. 5A is a side cross-sectional view schematically showing a case where a conventional color contact lens is worn, and is a view showing a case where the wearer is looking at the front. FIG. 5B is a side cross-sectional view schematically showing a case where the conventional color contact lens is worn, and is a diagram showing a case where the eye is moved from the case shown in FIG. 5A.

  As shown in FIG. 4, when the color contact lens 102 is attached to the eyeball B, the periphery of the color contact lens 102 is restrained by the upper eyelid UL and the lower eyelid LL. Since tears exist between the color contact lens 102 and the eyeball B, when the wearer moves the eyeball B, a gap occurs between the eyeball B and the color contact lens 102. In the color contact lens 2 according to the present invention described later, similarly, when the wearer moves the eyeball B, a gap occurs between the eyeball and the color contact lens.

In the conventional color contact lens 102 shown in FIGS. 5A and 5B, a border coloring portion 104 having a coloring dot of a color corresponding to the iris I is arranged at a position bordering the outer shape of the iris I of the wearer. However, the colored dots corresponding to the iris portion I are not arranged in the region inside.
When the wearer shown in FIG. 5A is looking at the front, the position of the contour of the iris I matches the position of the border coloring part 104. Therefore, the outline of the iris part I of the wearer can be clearly shown by the border coloring part 104.

On the other hand, as shown in FIG. 5B, when the eye is moved by an angle θ from the case of looking at the front shown in FIG. 5A, the color contact lens 102 cannot completely follow the movement of the eye, and the eyeball B and the color contact lens 102 Deviation occurs.
For this reason, as shown by the outline arrow in FIG. 5B, the sclera part (white-eye part) W located outside the iris part I indicated by the arrow X can be visually recognized from the outside. As a result, a white-colored area in the iris portion I is exposed, giving an unnatural appearance. In particular, the portion of the sclera portion (white-eye portion) W adjacent to the iris portion I has a large change in contrast from the iris portion I, so that other people's eyes are noticed and the sense of discomfort is emphasized.

  If the width of the border coloring portion 104 is greatly extended to the inside, even if a gap occurs between the eyeball B and the color contact lens 102, the sclera portion (white-eye portion) can be prevented from being exposed to the outside. However, in that case, the width of the border coloring portion 104 becomes too large, and an unnatural artificial appearance is exhibited.

(Solution of the problem by the present invention)
Next, it will be described with reference to FIGS. 6A and 6B that the above-mentioned problem can be solved by the color contact lens 2 according to one embodiment of the present invention.
In the color contact lens 2, a border coloring part 4 having a coloring dot of the first color corresponding to the color of the iris part I is arranged at a position bordering the outer shape of the iris part I of the wearer. Further, a transition coloring portion 6 having a coloring dot of the first color is disposed adjacent to the inside of the border coloring portion 4. As schematically shown in FIGS. 6A and 6B, the coloring density of the transition coloring portion 6 is distributed so as to decrease from the outside to the inside.

  When the wearer shown in FIG. 6A is looking at the front, the position of the outline of the iris I and the position of the border coloring portion 4 match, and the outline of the iris I of the wearer is clearly shown. it can. In particular, when the width of the border coloring portion 4 in the radial direction is relatively reduced, the contour of the iris I of the wearer can be clearly displayed in a more natural manner.

Next, as shown in FIG. 6B, when the eye is moved by an angle θ from the front view shown in FIG. 6A, a gap occurs between the eyeball B and the color contact lens 2. However, the sclera part (white-eye part) located outside the iris part I indicated by the arrow Y in FIG. 6B is covered by the transition coloring part 6. Therefore, as schematically shown by the colored arrows in FIG. 6B, the sclera (white-eye portion) W can be prevented from being exposed from the outside. In particular, the portion of the sclera (white-eye portion) adjacent to the iris I, which has a large change in contrast with the iris I and is easily noticeable by others, is covered by the region of the transition coloring portion 6 where the coloring density is high. Thus, the sclera (white-eye portion) W can be effectively prevented from being exposed. Therefore, in order to make the iris part of the wearer appear natural and clear, even if the width of the border coloring part 4 in the radial direction is relatively narrowed, the transition coloring part 6 exposes the scleral part (white-eye part) W. Can be prevented.
The coloring density and hue of the iris portion I gradually change, but similarly, since the coloring density of the transition coloring portion 6 decreases from the outside to the inside, it naturally increases. Appearance can be given.

  In particular, in order to effectively prevent the portion of the sclera portion (white-eye portion) adjacent to the iris portion I that is easy to catch the eyes of others from being exposed and to obtain a natural appearance, the transition coloring portion 6 to the transition coloring portion 6 are used. It is preferable that the coloring density is not continuously reduced but substantially continuously.

(Coloring density distribution of transition coloring section 6)
As described above, in order to prevent the sclera (white-eye portion) from being exposed even if a gap occurs between the eyeball B and the color contact lens 2, the transition coloring section 6 has a relatively high coloring density. Is more advantageous. On the other hand, if the coloring density of the transition coloring portion 6 is too high, it is difficult to obtain a natural appearance of the iris portion I.
For these conflicting phenomena, the following were found based on the results of actual trial production and testing of color contact lenses and various simulation results.

The coloring density can be represented by the density of colored dots having the same coloring density. In this case, the density of the colored dots can be represented by the ratio of the area of the colored dots to the area of the entire region where the colored dots are arranged. .
At this time, the density of the colored dots near the outer edge of the transition colored portion 6 is in the range of 50 to 80%, and the density of the colored dots near the inner edge of the transition colored portion 6 is in the range of 0 to 10%. Has been found to be preferable. Further, it has been found that the average value of the density of the colored dots in the entire transition colored portion 6 is preferably in the range of 25 to 45%, and more preferably in the range of 25 to 35%. In particular, it is preferable that the density of the colored dots continuously decreases from the border coloring section 4 to the transition coloring section 6.

  By having such a density of the colored dots, even if a shift occurs between the eyeball B and the color contact lens 2, it is possible to prevent the sclera (white-eye portion) from being exposed and to prevent the iris I from being exposed. The color contact lens 2 having a natural appearance can be realized.

  Even if a shift occurs between the eyeball B and the color contact lens 2, the sclera part (white-eye part) can be prevented from being exposed, and the color contact lens 2 in which the natural appearance of the iris part I is obtained. Therefore, it is preferable that the width of the border coloring portion 4 in the radial direction is 3 to 7% of the lens outer diameter, and the width of the transition coloring portion 6 in the radial direction is 6 to 10% of the lens outer diameter. I found that.

Also, in order to obtain the above-mentioned effects, the dimensions of each part of the color contact lens are as follows:
(1) The lens outer diameter is 13.5 to 15 mm,
(2) The diameter of the outer end of the outer transition coloring portion 8 is 12.5 to 14.5 mm,
(3) The width of the outer transition coloring portion 8 in the radial direction is 0.1 to 0.3 mm,
(4) The width of the border coloring portion 4 in the radial direction is 0.3 to 1.0 mm, and the width of the transition coloring portion 6 in the radial direction is 0.5 to 1.8 mm. . Although there is an individual difference in the size of the pupil, it is considered that many users can suitably enjoy the above-described effects in the above range.

(Color density distribution of border coloring part 4, transition coloring part 6, and outer transition coloring part 8)
Next, the coloring density distributions of the border coloring portion 4, the transition coloring portion 6, and the outer transition coloring portion 8 will be described with reference to FIGS. 7, 8A and 8B. FIG. 7 is a plan view schematically showing a border coloring portion, a transition coloring portion, and an outer transition coloring portion of the color contact lens shown in FIG. FIG. 8A is a graph showing an example of the distribution of the coloring density in the border coloring portion, the transition coloring portion, and the outer transition coloring portion shown in FIG. FIG. 8B is a graph showing another example of the distribution of the coloring density in the border coloring portion, the transition coloring portion, and the outer transition coloring portion shown in FIG. 8A and 8B, the horizontal axis represents the position in the radial direction R, and the vertical axis represents the coloring density. The graphs shown in FIGS. 8A and 8B can be used as a reference profile for coloring with colored dots.

<Example shown in FIG. 8A>
In the example shown in FIG. 8A, the border coloring portion 4 has substantially the same coloring density. In the transition coloring section 6, the coloring density is continuously reduced from the outer end B, that is, the inner end of the border coloring section 4, to the inner end A. Further, in the outer transition coloring portion 8, the coloring density continuously decreases as the color shifts from the inner end portion C (that is, the outer end portion of the border coloring portion 4) to the outer end portion D.
In this case, it is preferable that the coloring density decreases substantially continuously from the border coloring section 4 to the transition coloring section 6. Thereby, it is possible to effectively prevent a portion of the sclera (white-eye portion) adjacent to the iris of the sclera (white-eye) from being exposed, and to obtain a natural appearance. Further, in order to obtain a natural appearance, it is preferable that the coloring density decreases substantially continuously from the border coloring portion 4 to the outer transition coloring portion 8.

  FIG. 8A shows a linear graph in which the coloring density changes in proportion to the moving distance. However, the present invention is not limited to this. May change. In this case, it is preferable that the transition coloring portion 6 and the outer transition coloring portion 8 are connected by smooth curves at both ends B and C of the border coloring portion 4. In such a case, an arbitrary function such as a polynomial function (n-order function) exponential / logarithmic function, trigonometric function, or hyperbolic function can be used as the function indicating the curved graph.

<Example shown in FIG. 8B>
In another example shown in FIG. 8B, the coloring density of the central portion M in the radial direction of the border coloring portion 4 is high, and both ends B and C are within a certain range in which the wearer recognizes that the coloring is substantially the same. Has a low color density distribution. The central portion M here includes an arbitrary position between both end portions of the border coloring portion 4, and may be the approximate center position or may be close to either end.

As is clear from FIG. 8B, in the radial direction R, the color density continuously increases from the inner end A of the transition coloring portion 6 to the center portion M of the border coloring portion 4, and The coloring density is distributed so as to decrease continuously from the central portion M to the outer end portion C of the border coloring portion 4. Further, in the example shown in FIG. 8B, the coloring density is distributed so as to continuously decrease to the outer end D of the outer transition coloring portion 8.
As described above, the actual iris and sclera (white-eye portion) gradually change in coloring density and hue, and thus, similarly, the border coloring portion 4, the transition coloring portion 6, and the outer transition coloring portion. By continuously changing the coloring density of No. 8, a more natural appearance can be obtained when the wearer wears the color contact lens 2.

  As is clear from the graph of FIG. 8B, a graph having both the position in the radial direction R and the coloring density as the two axes is from the inner end of the transition coloring portion 6 to the outer end C of the border coloring portion 4 or the transition. A smooth curve is drawn from the inner end of the colored portion 6 to the outer end D of the outer transition colored portion 8. Thereby, even if a shift occurs between the eyeball B and the color contact lens 2, the sclera portion (white-eye portion) adjacent to the outside of the iris portion I is prevented from being exposed, and the color contact lens 2 is surely removed. It can give a natural appearance when worn.

As described above, the color contact lens 2 according to the embodiment of the present invention includes:
A border coloring section 4 which is a ring-shaped coloring area having coloring dots of the first color corresponding to the color of the iris I of the wearer, and which is arranged at a position bordering the outer shape of the iris I;
A ring-shaped colored region having colored dots of the first color, which is arranged adjacent to the inside of the border colored portion 4 and between the border colored portion 4 and the region where the first colored dot inside does not exist; And a transition coloring section 6 that connects
The coloring density of the border coloring portion 4 is within a certain range,
The coloring density of the transition coloring portion 6 is distributed in the radial direction so as to decrease from the outside to the inside.

  Therefore, the border coloring section 4 can clearly show the wearer's iris section in a natural manner, and is arranged inside the border coloring section 4 and the transition in which the density of the colored dots decreases as going from the outside to the inside. Due to the coloring portion 6, even if a shift occurs between the eyeball and the color contact lens due to the movement of the eyes of the wearer, the sclera portion (white-eye portion) is not visually recognized and has a natural appearance. A color contact lens 2 can be provided.

Next, referring to FIG. 9A to FIG. 10E, the results of comparison between an example in which a color contact lens according to the present invention was actually manufactured and mounted and a comparative example in which a conventional color contact lens was mounted are shown. This will be described below.
9A to 9E are diagrams (photographs) showing comparative examples using a conventional color contact lens. 9A is a diagram (photograph) showing a case where the wearer looks at the front, FIG. 9B is a diagram (photograph) showing a case where the wearer looks at the right side, and FIG. 9D is a diagram (photograph) showing a case where the wearer looks at the upper side, and FIG. 9E is a diagram showing a case where the wearer looks at the lower side (photograph). (Photo).
10A to 10E are diagrams (photographs) showing examples of the color contact lens according to the present invention. 10A is a diagram (photograph) showing a case where the wearer looks at the front, FIG. 10B is a diagram (photograph) showing a case where the wearer looks at the right side, and FIG. FIG. 10D is a diagram (photograph) showing a case where the wearer looks at the upper side, and FIG. 10E is a diagram showing a case where the wearer looks at the lower side (photograph). (Photo).

As a comparative example, a color contact lens having the following specifications was prepared.
1. Dimensions of each part (1) Lens outer diameter: 14.2 mm
(2) Diameter of outer end of border coloring portion: 13.4 mm
(3) Width of the border coloring portion in the radial direction: 0.67 mm

As an example, a color contact lens having the following specifications was prototyped.
1. Dimensions of each part (1) Lens outer diameter: 14.2 mm,
(2) Diameter of outer end of outer transition colored portion: 13.6 mm
(3) Radial width of outer transition colored portion: 0.22 mm
(4) Width of the border coloring portion 4 in the radial direction: 0.65 mm
(5) Width of transition colored portion in radial direction: 0.94 mm
2. Average density of colored dots (area of colored dots / area of entire area where colored dots are arranged)
(1) Outer transition colored portion: 6.8%
(2) Outer transition colored portion: 61.3%
(3) Transition colored part: 31.9%

<Comparison result>
In the comparative example using the conventional color contact lens shown in FIGS. 9A to 9E, when the wearer looks at the front (see FIG. 9A), the outline of the iris of the wearer is clearly shown by the border coloring portion. Can be. However, when the eye is moved right and left and up and down from the front view (see FIGS. 9B to 9E), the sclera portion (white-eye portion) following the outside of the iris portion is visually recognized as indicated by the arrow X. become able to. As a result, an area where white color is lost in the iris is exposed, and an extremely unnatural appearance is exhibited.

  On the other hand, in the embodiment using the color contact lens according to the present invention shown in FIGS. 10A to 10E, when the wearer looks at the front (see FIG. 10A), the outline of the iris of the wearer is changed by the border coloring portion. Since it can be clearly shown and the coloring density of the transition coloring portion decreases from the outside to the inside, a natural appearance can be given. Even when the eye is moved right and left and up and down from the front view (see FIGS. 10B to 10E), the sclera part (white-eye part) following the outside of the iris part is covered with the transition coloring part, and the arrow As shown by Y, the sclera part (white-eye part) is not exposed from the outside.

  As described above, even in a comparative test in which a color contact lens was actually manufactured, the operational effects achieved by the color contact lens according to the above-described embodiment of the present invention were demonstrated.

  Although the embodiments and modes of the present invention have been described, the disclosed contents may be changed in the details of the configuration, and combinations of the elements and changes in the order in the embodiments and the modes of the present invention are claimed in the present invention. Can be realized without departing from the scope and spirit of the present invention.

2 color contact 4 border coloring section 6 transition coloring section 8 outer transition coloring section 10 other coloring section 102 color contact 104 border coloring section B eyeball I iris section (black eye section)
W Sclera (white eye)
P Pupil UL Upper eyelid LL Lower eyelid

Claims (4)

An annular colored region having a colored dot of a first color corresponding to the color of the iris portion of the wearer, and a border coloring portion arranged at a position bordering the outer shape of the iris portion;
A transition coloring portion which is an annular coloring region having coloring dots and is arranged adjacent to the inside of the border coloring portion,
With
The coloring density of the transition coloring portion is distributed in the radial direction so as to decrease as going from the outside to the inside,
Change the color density by changing the density of the colored dots,
When the density of the colored dots is represented by the ratio of the area of the colored dots to the area of the entire area where the colored dots are arranged, the density of the colored dots near the outer end of the transition colored portion is in the range of 50 to 80%. By keeping the natural appearance of the iris part of the wearer, even if there is a deviation from the eyeball at the time of wearing, the sclera part of the wearer inside the border coloring part A color contact lens characterized by preventing exposure.   The color contact lens according to claim 1, wherein the average value of the density of the colored dots in the transition colored portion is in a range of 25 to 45%.   The color contact lens according to claim 1, wherein the density of the colored dots near the inner end of the transition colored portion is in a range of 0 to 10%. An annular colored region having colored dots, further comprising an outer transition colored portion disposed adjacent to the outside of the border colored portion,
The color according to any one of claims 1 to 3, wherein the coloring density of the outer transition coloring portion is distributed in the radial direction so as to decrease from the inside to the outside. contact lens.