Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A more comfortable alternative for glasses, contact lenses are getting more popular among adults, and young people, as it is believed that they are easier to wear, more healthy, fun and convenient than ever. Though the history of contact lenses can be traced back to the 1500s, when Leonardo da Vinci first introduced the concept, it was only at the end of the twentieth century that contact lenses gained momentum, becoming more sophisticated and safe. According to the US Defense Advanced Research Projects Agency (DARPA) – a new type of contact lenses could be developed in the near future for military purposes, offering a set of super features able to create superhuman vision and augmented reality. Learn more about contact lenses, their history, advantages and disadvantages in this book.