As far as the Gar go, I have caught them by accident while fishing for another species.
As far as the "Grandpappy" glasses go, I would love to find some that did work for me. I wear prescription no-line glasses with clip-on sunglasses and those that you showed, I feel would work better, but, I have tried them and do not like them. First they start to become heavy after a short while and they do not stay put and when they come in contact with my prescription glasses, they move them and I cannot see properly. I sweat easily and that is what causes them to start to slide down my nose and when they do that, they rest against my prescription glasses and cause them to move.
I really do wish I could find some similar that worked for me but they may work fine for you.
Fly fishing and fly tying are two things that I do, and when I am doing them, they are the only 2 things I think about. They clear my mind.