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Colored contact lens

Many people desire to have beautiful eyes and more recently people desire more beautiful and natural eye colors. Contact lenses are used for correcting poor eyesight, and in usual, colorless and transparent ones are on the market. However, colored contact lenses have been desired for the correction of color blindness, for facial beauty, for prevention of dazzlement in strong sunlight, protection of eyes against ultraviolet light, etc. Colored contact lenses are often used for cosmetic purposes to change the apparent color of a wearer's irises. For example, a person with brown or blue eyes desiring to have green eyes may wear green colored contact lenses to change the apparent color of a wearer's iris to green. Colored contact lenses are advantageous in that it is easy to know whether they are in a lens case or not and to discriminate a lens from the others, and that missing one can be easily found out. Moreover, they are useful to protect eyes from strong ultraviolet rays or to protect a person from being dazzled under direct sunshine. Further, this may improve the image of contact lenses. In general, there are two types of colored contact lenses. The first are contact lenses which use essentially transparent enhancement colors that allow the color of the natural iris to show through but combine with that natural color to produce a new appearance. Such tinted lenses are typically used to turn a light eye to a slightly different hue . This class of colored lenses may not be able to change an underlying dark colored, brown iris to blue. Tinted contact lenses have gained greater popularity as a result of the rise in the general acceptance of contact lens, greater public sensitivity to personal appearance and improved contact lens structures (hard lenses vs. soft lenses vs. oxygen permeable lenses, etc.). The second category is the class of opaque colored lenses having a continuous opaque pattern that fully covers the iris or having an intermittent opaque pattern that does not fully cover the iris. Opaque colored contact lenses can effectively and substantially modify the wearer's eye color.

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