I wear corrective lenses. I used to have perfect vision, until about highschool, when I began becoming short-sighted. I got glasses, but I could still see the chalk boards from the back of the room so I didn't wear them much.
By the time I was in my senior year, I was starting to wear them more.
A few weeks ago I got a new prescription for contacts and my vision is a little worse than it was all that time ago. my glasses no longer allow me to see better than 20/20.
My new contacts are awesome, I can see better than 20/20 with them in.