There are four types of color contact lenses: visibility dyes, additive dyes, dyed dyes, and light filter dyes.
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In the color contact of the visibility tone, a light blue or green color is added to the lens for better viewing of the lens. Dyes are usually too light to change eye color.
Color repairs darker than visibility shadows. This is used to improve the color of the eyes, and works best on people who have bright eyes naturally.
Dyes further and can completely change the user’s eye color. The center of the lens is clear so the vision is not affected, but the rest of the lens has a blurred tone. Colored contacts are available in various colors including amethyst, blue, gray, green, brown and purple.
Some athletes use a special type of color contact known as light filtering dye. It enhances certain colors, helps the user, for example, to better detect the tennis ball. Lenses have been developed to help golfers differentiate different types of green on the golf course. Other similar lenses are being developed for other sports.
The colored contact has several disadvantages. Sometimes the lens can glide, making the eyes a bit strange, as part of the natural color shown. Some colored contacts may impair good vision if the transparent area at the center of the lens is not large enough to accommodate the increased pupil size under low light conditions.
Like all contact lenses, colored contacts match the eyes of a particular individual and should not be used by others. Lens exchange can also contribute to the transmission of pathogens that are responsible for infection or other adverse conditions.
Color contacts can not always be used to correct vision, but, like all contact lens types, contacts should be cleaned and disinfected regularly.