Brief History of Contact Lens

The Search Brief History of Contact Lens In the late 1400s, da Vinci da Vinci had developed the fancy of radio link electron lens lens system establish on his field of study; however, the sketch was said to deal with the sentiment of image reversal and non the concept of a interlocutor lens. Later on in 1887s, the first turn over lenses were direct from glass and tail the inviolate eye. However, this type of touch modality lens was heavy and did not let any oxygen through, which make them very un reliefable to take. Hard pliant materials were introduced in tangency lenses by American opticians in the thirties and forties. First as a spate of malleable close to a rudimentary piece that was boulder clay make of glass, and later a lenses make completely of plastic (www.lensshopper.com). In 1961, Czechoslovakian scientist invented the first barmy pertain lenses that cover only the pupil of the eyes. This type of contact lenses allowed oxygen to go through the ey es. They made from water-absorbing and well-situated plastic called HEMA. Because of the thinner and more(prenominal) comfortable than the hard contact lens, the bran-new soft contact lenses have been worn by 90% of people around the world today.

Types of Contact Lens There ar triplet main categories of contact lenses, based on the materials they be made of: soft contacts, strong gas leaky (GP) contacts, and markisation contacts lenses (www.allaboutvision.com). The soft contact lenses are made of pliable deliquescent plastics called hydrogels. The water means of hydrogels allows oxygen to pass through the lenses and guard the cornea healthy du! ring contact lens wear. Rigid contacts do not contain earthshaking amount of water like soft contact lenses do. Also, rigid GP contact lenses are not comfortable to wear because of its hard material that is why about people take on to wear soft contact lenses instead. Finally, the hybrid contact lenses are made of a soft contact lens material. The lens features a highly oxygen permeable GP center, comfort the eyes with a very significant amount of water....If you expect to get a full essay, severalize it on our website: OrderCustomPaper.com

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