A contact lens (also known as contact lens, lens or contact) is a corrective lens, cosmetic or therapeutic placed on the cornea of the eye.
Leonardo da Vinci in 1508, was the first to have had the idea of contact lenses, they will be developed in 1887 by the German ophthalmologist Adolph Eugene Fick.
The soft contact lenses were invented in 1961 by the Czech chemist Otto Wichterle, who also invented the first hydrogel used in their production. They have the same function as eyeglasses but are distinguished by their small size and near-invisibility. Many contact lenses are slightly tinted blue to better distinguish them in their storage case. Cosmetic contact lenses are specifically colored to alter the appearance of the eye.
About 125 million people worldwide wear contact lenses (2%) that 28-38000000 United States, and 13 million in Japan. The types of lenses used and prescribed vary markedly between countries, with rigid lenses that count approximately 20% of prescribed lenses in Japan, the Netherlands and Germany and less than 5% in Scandinavia.
Users choose to wear contact lenses for Various Reasons. Many Consider Themselves more attractive by wearing contact lenses of glasses INSTEAD of view. Contact lenses are not Affected by the weather, do not and do not affect s'embrument vision. They Are Widely Used by athletes particularly. Finally, Eye Problems Such as keratoconus or better aniseiconia are Treated by wearing contact lenses.