Progressive bifocals and traditional Vision 20/20 Protocol Ebook Review bifocals differ in mainly two aspects. One is uninterrupted central vision and the other is contemporary appearance. Many products we now use have very long history, so do contact lenses. The manufacturing history of contacts can be dated back to 1887, the time when the first contact lens came into being. It was created by a Germanic people and can be directly touched to the eyeballs without discomfort. And it had proved that the first contact lens can help enhance vision.
However, the theoretical history of contacts is much longer and can be dated to the 16th century. The extant data has it that the first person who has got the idea and theory of making contact is Leonardo Da Vinci. As time goes by, his thoughts are deciphered by his followers several centuries later. And many practical inventions are based on those theories. During the following years, some other people have spared no effort to put his thoughts into practice. Of which, Descartes, a French philosopher is a case in point. Though he failed in practice, but he agreed with what Da Vinci thought.
Since the emergence of the first contact lens in 1887, more and more problems are arising in those contacts. The modern contacts are very typical. In the past, contacts can not be worn too long, for wearers will suffer from some potential problems and discomfort. Luckily, people in nowadays can wear them for much longer time, or even for all day and night long. Among those contacts, Focus Contact lens are very typical.