Those tinted bi-focal safety glasses work well for fishing too. I've had many people comment on them.
They see the adjustable temples/silicon no-slip nose piece and they think I paid big bucks for them. ;D

I let the try them on and when I tell them they were about $15 they can't believe it. At that price you can bring a couple on a canoe trip, keep a pair in every vehicle. I like the Radian brand but there are others about the same price but I can't personally vouch for them.