I've worn eyeglasses since I was in second grade, but when I wore contact lenses instead, I did notice that ear muffs were more effective. It's not a real big difference, but it's noticeable. I've worn ear muffs over a wool knit cap and they still seemed to be pretty effective, but I wouldn't do that with any really loud guns. When I'm going to be shooting a lot, I double up with ear plugs and ear muffs.
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