Lenses for Daily Wearing

Contact lenses are small, made of transparent material lenses worn directly on the eye for vision correction. Discount contact lenses, according to experts, are wearing about 125 million people in the world. The method of vision correction with contact lenses is called contact correction of vision. Almost 50% of those who wear contact lenses are young people aged 18 to 25 years. And among those who wear contact lenses for the first time, the proportion of young people under the age of 35 years, almost 90%. For the first time the idea of using the contact correction suggested by Leonardo da Vinci in 1508. The archive of his work is drawing the eye with a water-filled tray - a prototype of modern contact lenses. In 1888 A. Fick described the first glass lens having optical power. Until the 1960's contact lenses are made only from organic glass. Rigid lenses were uncomfortable to wear, cause foreign body sensation in the eye and did not miss a cornea is necessary for its normal functioning oxygen.

In 1960, the Czech scientist Otto Wichterle synthesized a new polymer and makes him the first soft contact lenses. Lenses became known as soft as this polymer has the ability to absorb water (38%) and after saturation with water becomes very soft and elastic. Thanks to water contained in lenses they were much more comfortable to wear than hard lenses, and, besides, they passed a sufficient amount of oxygen for safe daily wear. An era of soft contact lenses, which are now successfully replaced by the hard contact lens with a market correction. About 10 years ago, a new generation of soft contact lenses silicone hydro gel contact lenses, providing the user with contact lenses more comfortable and safe use of this form of vision correction.

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