I use Decot HY-WYD Sport Glasses, 1800-528-1901. The lense are prescription for me and rose color works best outdoors. I get the upper part cut to see the sights and the lower part is for seeing distance. The lense slip off easy and can be changed, they cost about $125 for a lense. You can get a lense coated to protect against say a .22 at 10 feet. The frame is sturdy and I cannot remember its cost.