Colored contact lenses come in three kinds: visibility tints, enhancement tints and opaque color tints.
Many of these colored contact lenses are available in plano form, as well as in designs for people who have astigmatism, need bifocals or want a disposable contact lens.
A visibility tint is usually a light blue or green tint added to a lens, just to help you see it better during insertion and removal, or if you drop it. Since it's a very light tint, it does not affect your eye color.
An enhancement tint is a solid but translucent (see-through) tint that is a little darker than a visibility tint. An enhancement tint does change your eye color. As the name implies, it's meant to enhance the existing color of your eyes. These types of tints are usually best for people who have light colored eyes and want to make their eye color more intense.
Color tints are deeper, opaque tints that can change your eye color completely. Usually they are made of patterns of solid colors. If you have dark eyes, you'll need this type of color contact lens to change your eye color. Color contacts come in a wide variety of colors, including hazel, green, blue, violet, amethyst and gray.
The companies that make colored contact lenses have gone all out to mimic the natural look of the colored portion of the eye, called the iris. Since this area is made up of colorful shapes and lines, some color contacts feature a series of tiny colored dots on the lens to make them look more natural on the eye.
But the center of the lens, the part that lies over your pupil, is clear so you can see.
Costume or theatrical contact lenses also fall into the category of opaque color tints. Long used in the movies (examples are The Man Who Fell to Earth and Twilight), these special-effect contact lenses are now widely available for novelty use and can temporarily transform the wearer into an alien or jaguar, among others.
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