Know About The Technology Behind Contact Lenses

Contact lenses were made of glass, and were scleral lenses. Scleral lenses are large contact lenses that cover the complete sclera - the white outer coating - of the eye. These unwieldy lenses could only be worn for a short period at a time. With the development of PPMA - polymethyl methacrylate - in the 1930s, plastics were first used in contact lenses. These lenses are designed to correct astigmatism and myopia or hyperopia, if required.

Manufacturing contact lensesare 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.The contact technology transferlenses can worn comfortably and for longer periods.

Silicone hydrogellenses are designed to correct astigmatism and myopia or hyperopia, if required. These lenses came to be known as 'breathable' contact lenses. This made it possible for contact lenses to be worn comfortably and for longer periods. In addition, there are color contacts, which are for cosmetic purpose.

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