I always do, except today when I didn't -wear safety googles. I wear glasses so didn't don the safety glasses because it was cold in the shop 38* F or so. To lazy towarm them up.
Sure enuf, taking a cut on the lathe, a curly blue chip shot off the work and embedded itself underneath the edge of my prescription lens, 1/2" below the right eye. I actually watched it launch up and could see it fly my face. I couldn't react quickly enuf to avoid getting embedded. Had to actually pull it out of the old epidermis. Hot and sharp. Couldn't believe it. This was a once in a 10,000 hit, but every 10,000 chips one is going to fly towards your head! Be prepared!