I'm a HUGE fan of the "Clics" Warren posted about. I've had mine for 5 years of daily wear. They finely broke and I've since replaced them with the same. They work great for on the river too. You'll become more challenged as time goes by though, especially with the really small flies (I love fishing small flies). In that case I bring an extra, cheap pair of cheaters, that gives me that added magnification for threading tiny tippet into tiny holes. Works great. (You can also use those clip on flip ones for this purpose...but the Clics are a MUST HAVE, IMHO. I LOVE THEM.