I don't wear glasses, but I do wear contacts. Without them, I'm as blind as a bat, and literally can't see my hand in front of my face (extended at arm's length).
My sister found these on campus; some scenester had popped the lens out (lucky for me - all the better for pictures!).
I never wear glasses because I'm too rough with them, and always break them in irreparable places. I also hate how my peripheral vision is blurry.