I'd like to propose another use case: HUDs.

I've recently took up cycling to work and back, and would love to have speed/gears/time up on the glasses, instead of having to look and focus down. Riding my scooter would also be better with it, since the speedometer and turning light indicators are a bit out of my normal field of vision.

Also, be able to see who's calling on the cell phone would be a plus (I've found that having the phone 'say' who's calling results in a jumble that I can't make heads or tails of, as most of the names are not English names)