Google apparently has invented a way to stream information into eyeglasses as a heads up display.
1) I wear glasses. What is Google gonna do for me? No offence, I trust you with my email and documents, but I will not be adopting Google Lasiks.
2) I hate those people that talk to the thing in their ears when I am helping them. How am I going to deal with some asshole watching Breaking Bad on Netflix while trying to talk to me?
3) Driving. See #2
4) Uneven sidewalks. See #2
5) Despite all this, I really want some.