I have prescription sunglasses. I always wear them when I'm swimming in the ocean. One afternoon, I'd been cooling off in the waves for a while and I said to my partner I'll just dive under one last wave. You guessed it. I lost my sunglasses. I searched the sandy bottom but ti think they must have been taken straight out to sea. You can get a rubber strap to hold them more firmly on your head when you go swimming. You were REALLY lucky to get your glasses back!