I always wore glasses when using saws, staplers and the like but now I wear them pretty much any time there is constructing or industrial activity involved... Was passing some iron pipe up a stairwell, and discovered hours later as I was driving home that I caught something in my eye. Must've sat on the eyelid until I blinked just right--an iron shaving from the end of the freshly cut pipe embedded itself on the edge of the cornea. Fortunately, it didn't do any permanent noticeable damage although they had to basically sand out a spot of rust where the iron sat. Supposedly, there's still a bit of rust left but the optometrist didn't take a picture for me to show everyone
