The cost of a piece of metal in your eye.
Sounds like this is something we've all learned the hard way. I've been there......twice. First time it sat in there for a couple days and formed a rust ring. One nurse held my head in a brace while the other used a Dremel (no crap) to grind the rust out of my eye. Second time I went to the eye doctor and he got it out with a q-tip. Had a little rust but it was far enough into the whites of my eye he said it wouldn't affect anything. Tried grinding it but it just made it bleed so he left it. Haven't had any issues but I've learned that no matter what I'm doing I wear goggles or a face shield. Don't need to go through that again.