colored contact lenses

Abstract

A colored contact lens (10) comprising an iris-coloring part (40) that is to be overlapping an iris area (38) of a wearer's eyeball (12) and / or a circular colored band (42) that is to be overlapping inner and outer circumferential sides across a boundary (36) between a cornea (14) and a sclera (34), wherein centers of the iris-coloring part (40) and / or the circular colored band (42) are skewed to one side from a lens geometric center (20) on a radial direction line (22), the radial direction line (22) passing through the lens geometric center (20), and a positioning means is provided to position a lens circumferential direction position so as to stabilize the radial direction line (22) at a position extending in a lateral direction of the wearer's eyeball (12).

Description

technical field [0001] The present invention relates to a colored contact lens, and in particular, to a colored contact lens capable of imparting a cosmetic (beautifying) effect to a wearer's eyes by providing a colored area on a specific site. Background technique [0002] Several colored contact lenses have been proposed since the past as a type of contact lens worn overlying the cornea of ​​the eye. For example, in Japanese Unexamined Patent Publication No. JP-A-60-235115 (Patent Document 1), an item having an iris colored portion which is an iris coloring portion superimposed on which can be seen through the cornea is proposed. Iris color The colored area of ​​the iris area that makes it possible to make the so-called black part of the eye appear to be a different color than the original color. [0003] Furthermore, a colored contact lens is proposed in PCT Japanese Translation Patent (Patent Document 2) with Publication No. JP-A-2008-511025, which is colored up to the ...

AI Technical Summary

Problems solved by technology

[0004] However, with such colored contact lenses recorded in Patent Document 1 and Patent Document 2, although different evaluation images of the wearer's expressions can be given to the observer, there are often cases where these give the observer an unnatural feeling.

Specifically, when a colored contact lens of a conventional structure is worn, even when the wearer faces the observer and has a line of sight facing the observer, there are cases where the observer does not feel the wearer's line of sight facing the observer himself

[0005] And, when the surrounding environment is relatively dark, such as at night or the like, by making the diameter of the wearer's pupil larger, there is a case where the inner peripheral area of ​​the colored area enters the field of vision and there is a case where the wearer's vision is obstructed. risk, which gives a perception of a darker degree, and as such makes securing a safe view impossible

In particular, when colored contact lenses with ring-shaped colored bands are often used, it is easy to cause the inner peripheral edge part of the ring-shaped colored band to enter the field of vision, and there is also a risk of strabismus occurring

Response to this situation, although it is conceivable to make the inner diameter of the annular colored band larger, in which case the width (difference between the inner and outer diameter) of the annular colored band becomes smaller, This makes it easier to separate the edge portion of the inner periphery of the annular colored band from the border of the cornea and sclera (heterochromic edge), which risks compromising the wearer's appearance

[0006] In addition, because it is relatively difficult for the contact lens to move toward the nose, when the wearer has a line of sight directly facing the side, etc., there are cases where it is impossible for the contact lens to follow the movement of the wearer's eyeballs, and the annular The edge portion of the inner perimeter with the colored band is greatly offset from the wearer's different colored edges on either side of the nose, which gives the viewer an unnatural feeling

Response to this situation, although it is conceivable to make the inner diameter of the annular colored band smaller, in this case, it is inevitable to make the outer diameter of the optical part positioned at the center of the lens smaller, which will makes the field of view itself narrow, so this is not a usable measure

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