I have worn contact lenses for a long time due to near sightenness. They are lenses placed directly on the eye.
Oh!  Are they really helpful for your vision and better than glasses?
They provide a clearer vision than glasses, especially with regards to peripheral vision.
That sounds like a great benefit!  Are the comfortable enough to not realize they are in your eyes?
I believe so.  They work for a lot of people.  Over 125 million people worldwide wear them.
Wow!  I would never have guessed that many people wore them!  When were contacts invented?
I really have no idea.  I do know I prefer them when I play sports or do outdoor activities.
Yeah, that sounds so much more convenient than having to wear glasses!  Are they expensive to use?
Not as much as glasses.  Although glasses can protect from light and radiation better than contacts.