The Human Eye Is A Perfect Well Designed Optical System

Abstract According to the report for the 2012 National Health Interview Survey, at least 1.5 million Americans weakened their vision due to use of technology. However, thanks to advanced technology and innovation people can choose between glasses and contacts as a therapy for improving their eyesight. Contact lenses have become the fastest progressing medical devices in optometry and have seen a number of significant improvements and developments since its existence (Schaeffer, 2011). According to Centers For Disease Control And Prevention, the first plastic contact lenses were produced between 1938-1940 in the United States and the first soft lenses came later in the 70s. Keywords: Contact lenses, glasses, cornea, astigmatism, eye†¦show more content†¦Perovic had. I did not want to look anything like her! First day of school was right around the corner and as I was getting ready for it questions kept circulating in my mind. What would my friends think? I was the only one with glasses. How would I play sports with glasses? Would I still get invited to birthday parties? Will boys like me? Some of my friends thought my glasses were cool, but deep inside I knew they were just trying to make me feel good. I still got invited to the parties, but boys did not like me. But all of that did not bother me as much. What bothered me the most is that I could not play sports with my glasses. They kept slipping from my nose or falling off my face on the ground whenever I tried jumping or doing cartwheels. I thought my life would never be the same.  ¬ Loss of vision can happen at any age, even at birth, it is not only geriatric condition. With increased use of technology people’s eyesight gets worse causing eyestrain, loss of vision and other problems. More than 30 million people in the U.S. wear contact lenses due to eye conditions such as myopia, hyperopia, keratoconus, astigmatism, or presbyopia (Ã… ¢Ã„Æ'lu et al., 2011). Though contact lenses seem to be a recent phenomenon, the famous Italian architect, mathematician and inventor Leonardo da Vinci (1452-1519) produced the first known sketches for it five hundred years ago (Siviglia, 2010). This paper will examine the