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Contact lens
A contact lens is a corrective or cosmetic lens placed on the cornea[?] of the eye atop the iris.
Made of various kinds of plastic, contact lenses come in a number of varieties, including hard and soft (although soft is by far more common now), and disposable and extended-wear. The specific dioptre needed to treat the patient's condition can be prescribed by an optometrist and provided by an oculist[?].
Tinted contacts, which may or may not be prescription but are tinted to change the colour of the iris, are used for cosmetic reasons.
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