I've worn specs since a kid, and thought about this also. I believe there's a sensory effect, removing the visual element (ie rig now blurry) and therefore the auditory becomes acute. More focus on ears, less on eyes. That's my theory anyhoo.
Related: all the ballcaps I see at audio shows. Hey blokes: take your hat off. We don't care you're bald. Nobody cares. A reflective ridge over your head and ears, at an audio show? Really?
Related: all the ballcaps I see at audio shows. Hey blokes: take your hat off. We don't care you're bald. Nobody cares. A reflective ridge over your head and ears, at an audio show? Really?