Olympus have introduced a non-instrusive HMD. Ubicomp here we come.
My personal experience with such things says that users prefer displays that can be moved around their field of vision. There's a reason we point our heads towards things when we read them. I think I would enjoy glasses with say three built in low-profile LEDs that notify me of events (blink pattern and colour indicating what type), then a small flat wrist-mounted display for the actual reading (as wide as you prefer) rather than having the information in your face all the time. There also aren't too many instances where a HMD is that useful - you have to change focal length to read things, and it tends to be more distracting than anything else (which is of course, why I made one for my car .. hi again, Darwin!).
I think it could drive me nuts too - I'm one of those people who will absorb all text within my field of view during the briefest glimpse, parse a few words out and fit them together in my head, just have to go back and read it again to see if it really said what I thought it did (my version is usually much grottier), so if something's pushing text at me in my peripheral vision, I'm just never going to get anything done.
All that considered, it doesn't stop me wanting one of these gizmos so badly I could burst.
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