[Shooti]

According to David Pogue of the NYT who tried them on back in September the display is "invisible" unless you focus on it:

"The biggest triumph — and to me, the biggest surprise — is that the tiny screen is completely invisible when you’re talking or driving or reading. You just forget about it completely. There’s nothing at all between your eyes and whatever, or whomever, you’re looking at.

And yet when you do focus on the screen, shifting your gaze up and to the right, that tiny half-inch display is surprisingly immersive. It’s as though you’re looking at a big laptop screen or something.

(Even though I usually need reading glasses for close-up material, this very close-up display seemed to float far enough away that I didn’t need them. Because, yeah — wearing glasses under Glass might look weird.)"

http://pogue.blogs.nytimes.com/2012/09/13/google-glass-and-t...