Smart glasses freak me out. They should freak you out too, since being analyzed (and who knows what else they do) by them without consent is a huge breach of our privacy.
Here's a nice Android-app which tells if someone is stalking you with them. Then you can take a look around and give'em some harsh words 馃榿
https://play.google.com/store/apps/details?id=ch.pocketpc.nearbyglasses&pli=1