the invention of organic glass

Believe it or not, contact lenses without very than glasses counterparts, that is to say, they are actually made of glass with different! Although Da Vinci and dream contact idea, wear contact sometimes believe not, until hundreds of years later by the German Department of Ophthalmology physicians (named Adolf Gaston Yukinfik, if you care). These glass monster practical work, but the real glass, can only wear, at most, a few hours. Since then, much more progress the evolution of contact lenses.
After a period of time before the invention of organic glass, this is not about fifty years, there are some different available contact. These are much lighter, easier to use - but they still then the whole was created to protect you against accidental damage (this type of insurance is not around, because you can imagine how fragile and expensive insurance plans.
These contacts have other problems, even if they are far better than glass, they did not make any oxygen eyes. No. This leads to a variety of problems, you can imagine (especially if you had in your eyes to leave your contact too long). Fortunately, since then, they came up with the hard contact, can let the air out of the eye.
Kind of contact lenses, you might be more familiar with are those with a "soft lens". For the first time to use these contacts in the nineteen sixties, and over time became a prescription for most patients with type of lens. Unlike hard contact lens, it doesn't take a long time for the wearer to play, they are more comfortable. With the passage of time, soft lens behind the technology continues to improve, in order to make more of the wearer's eyes, and to get more air.