When it comes to sunglasses you get what you pay for. If you are young and you have 20/20 vision you can get away with cheaper plastic lenses if you don't want spend the money. If you are on the wrong side of 40 pay the money and get the best quality optics you can find. With most top brands if you need a script you can place an order with your retailer.
Lens colour copper is the best in fresh water in good daylight, in low light conditions amber is the preferred colour. For bluewater blue or grey lenses with a reflective tint are popular. I use the copper lens in both salt and fresh water conditions and I see fish just fine.
I like the wrap around frames as they let in little light from the sides, they are not as fashionable these days but I'm past that, I just look for function. Once again it's a personal choice.
