I have an old pair of eye jackets. One day, I made the mistake of trying to polish the scratches out of the lenses, and used metal polish on the exterior of one of the lenses, and quickly discovered that there was a coating on the lens that I was rubbing off. The area I'd been polishing was different in appearance than the rest of the lens, and rather than leave that spot that way, I decided to remove the rest of the coating from that lens so that it looked uniform. I recently brushed these off and began wearing them again. I got to thinking, what is the coating on the outside of the lens, does it have anything to do with UV protection, and are these glasses safe to wear as far as protecting my eyes? The eye jackets are long discontinued, so there's no ordering replacement lenses.