Since Glass just displays a small rectangle at upper right part of your visual field, it's not much use for that sort of application. You'd have to twist your head around until the virtual screen appeared to cover the object you wanted to look at.

Seriously, I'm amazed how many people seem to think Glass can place things anywhere in their visual field, when it's very definitely restricted to a small rectangle, as though you were holding a smartphone about a foot away from your head.