back when I wore glasses I had a VERY bad experience. We were strapping a load down on the truck and my buddy was pulling on a bungy strap trying to clip it onto the tie down point.....when it sliped out of his hand and hit me square in the face.
The hook hit the lens of my glasses pushing it out of the frame and into my eye. Didnt break tho! I thank god I had my glasses on that day, other wise I may have been less one eye...