CONTACT LENS BY

1. CONTACT LENS BY NICHOLAS JOHNSON JULY 10TH 2009

2. Contact Contact Lenses Lenses ?????What are they made of????? ????? ???? ????

3. What is a contact??? . The idea of contact lenses were originally a sketch back in Leonardo Da’vinci time. . And from that time it would take another 300 hundred years for a contact lens to be created. . In the end of the 19th century, experiments with contacts of glass were performed by physicians and opticians in Germany, Switzerland and France, building on the idea of British astronomer Herschel of fitting the lens perfectly to the eyes surface using a mold of the wearer's eye.  . . Hard plastic materials were introduced in contact lenses by American opticians in the thirties and forties. First as a band of plastic around a central piece that was still made of glass, and later as lenses made completely of plastic. At the beginning of the fifties, the hard plastic lenses still covered the entire cornea, but the diameter and thickness of lenses diminished gradually until reaching today's design towards the beginning of the seventies. . .

4. Chemical break down!!!!!! • Contacts are made of polymers or poly(methyl methacrylate) (PMMA). • I --(--CR1 CR2 --A--)-- (I) this is the formula that is used for polymers to create or to be in the process of making cintact lenses

5. The changes contact lenses has made to day • Ever since the contact lens was made it has bettered the vision of many people including my self. • It’s another way for people to see clearly without wearing glasses, and it also presents a better picture of objects and they have become more comfortable over the years since they were made. • I believe that people enjoy wearing contacts more then they wear glasses, because contacts can’t break like glasses can.

6. http’s and more • www.webmd .com • www.google.com • www.healing daily.com