Just to add to what Sonny said, I use lenses in both my 3D outfits. They do help me see better on longer shots, but really aren't necessary for shorter ones. For hunting I don't think they are very practical. For one thing most hunting distances don't require pinpoint accuracy and are not long enough for derive much benefit from a lens. Rain drops, snow, and even dust on the lens can render them just about useless. Depending on sun angles they can have glare.
So for target or 3D they work fine. For hunting? Probably not a good idea.
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