Why 'invisible smart glasses' are the perfect wearable

What if smart glasses looked like regular, everyday glasses?
Google Glass was derided in the press as a dorky, clunky, privacy-invading error. (In truth, it was a bold experiment that launched the smart glasses revolution.)
Google Glass proved that conspicuous wearables don't belong on your face. The camera made people nervous. The screen caused a malady I called "Glass eye" (pain from having one eye exposed to bright light in a dark room). Looking at the Google Glass screen created awkward soc