I wear Blueblockers over my coke-bottle bottoms.
I drilled a hole in each temple and put a string around the back. Only ones I lost were new ones without the string- on a lead sled trip. They even warranty them when you sit on them..... be careful with scratches tho. Lick them off and they will last for years BUT DONT RUB.

Dacarls:
A-class USA 196, USA 21, H18, H16
"Nothing that's any good works by itself. You got to make the damn thing work"- Thomas Edison