Contact lenses are optical accessories which are placed directly on the cornea. They are similar to glasses because the task they have is the same: to provide better vision. There is a difference however: a contact lens is a lot more comfortable than the classical glasses and provides a more natural vision.
A few things about contact lenses
Nowadays, it is estimated that more than 100 million people around the world wear contact lenses. These items are very popular and technology improves them daily making them even more desirable.