My concern is people like myself who wear prescription eye glasses who may want to try Google Glass so end up putting the device on prescription glasses. It's one thing to remove your Google Glass glasses to be polite or legal i.e. washroom, locker room, driving a vehicle but for me that wouldn't be an option.

Also, I wonder if I could make a pair of infrared LEDs put them on my person somewhere to emit an interference beam pattern to mess up the camera on someone else's Google Glass glasses.