The Physics Of Contact Lenses

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Contact lenses are used for vision correction and are placed on the cornea of the eye. They do the same corrective function that conventional spectacles, or glasses, do. However, in comparison, they are very light in weight and are, for all purposes, invisible. Contact lenses help form the image on the retina of the eye by either converging or diverging the rays of light entering the eye.
Earlier contact lenses were made of glass, and were scleral lenses. Scleral lenses are large contact lenses that cover the complete sclera