Put a hinge on the camera and display module; flip it up towards the sky to turn Glass off. Down it's on, up it's off.
Give wearers a simple, clear way to communicate that they've turned Glass off when it's inappropriate to have it on and at least you'll ensure that Glassholes are a subset of assholes. (There's not much you can do about the assholes.)
Give wearers a simple, clear way to communicate that they've turned Glass off when it's inappropriate to have it on and at least you'll ensure that Glassholes are a subset of assholes. (There's not much you can do about the assholes.)