I use amber clip-ons due to the fact I wear bifocals and have not yet gotten my "fishing glasses". I don't remember the brand, but for low light situations, such as stream fishing under a heavy cover they work very well. They do not block the bright sun as grey or green lenses do. I have a seperate set of clip-ons in smoke (kind of grey) for those times when I need them.
Hope that helps.
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Clint
I feel closer to HIM when I'm fishing.