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Contacts cling to the film of tears over the cornea because of surface tension, the same force that causes a drop of water to cling to the side of a glass. Contacts provide a safe and effective way to correct vision when used with care and proper supervision. They can offer a good alternative to eyeglasses, depending on your eyes and your lifestyle. Over 24 million people in the United States now wear contact lenses. Contact lenses are generally made from a gel like plastic that contains around 38% to 79% water thus providing better comfort and longer life which makes them soft. A contact lens is a very thin optical disc smaller than a dime which is worn directly on the eye. Contact lens basically rests on the cornea. It is comfortably held in place by eyelid’s pressure or by adhering to the tear film that covers the front of the eye.
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