In general the contact lens is a utensil worn in the eye to correct vision, also people like to wear colored contact lens to improve or change their eye color. The lens made of plastic floats on a film of tears directly on top of the cornea.
For some forms of eye disease, contact lenses correct vision better than conventional spectacles. Contact lenses most effectively neutralize visual defects arising from irregular curvatures of the cornea. They are the preferred treatment for some varieties of astigmatism and aphakia (absence of the eye’s crystalline lens). They also can be functionally and cosmetically appealing substitutes for eyeglasses to treat myopia (nearsightedness) and other visual defects.
Many people prefer contact lenses over glasses for cosmetic reasons, and active sports enthusiasts prefer contact lens because of the freedom it provides them.
There are basically three types available: Soft lenses, hard lenses and gas-permeable (GP) lenses. Gas-permeable lenses are a compromise between the hard and soft, allowing greater comfort than hard lenses but less chance of tearing than soft lenses.
Contacts are usually worn during the day and taken out every night for cleaning. Extended-wear lenses allow users to leave in their contacts for longer periods of time, even when they're sleeping. More recently, one-a-day contact lenses are gaining popularity among lens wearers. These contacts are worn for only one day and thrown away, eliminating the hassle of cleaning them every night.
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