Speaker imaging

Eyeglasses lenses reflect and diffract higher frequency sounds into your ears, a form of noise that overrides much information, including some soundstage-width information.

Listen to a recording with horns and one with tambourines with and without glasses. Also, the esses and Tees of the female voice are affected by glasses.

Best regards,
Roy

It's quite simple really... your brain has an easier time seeing and hearing things that don't actually exist when there are fewer cues in the environment that suggest the hallucination isn't real. Reduce those cues (by removing light, taking off glasses, closing your eyes, etc.) and you will get a more "intense" image.

I agree with the guy above.

Also I just happened to try this the other day. Except I closed my eyes first, and then took off my glasses. Sounded exactly the same. So the sound wasn't changing. Taking them off while still open blurs everything visually, doesn't change the sound at all, but does seem to allow the brain to believe more that it is closer to really being there.

I suggest not wearing any clothes