Comment by observationist

Part of it is civics. You have the right to record in public. Being in a public space means you are consenting to being recorded; it's in public. It's not always moral, classy, correct, or good, but the alternative is the erosion of the principles of free press, freedom of expression, etc.

The form factor of the camera doesn't matter. We do have different constraints, but those are pretty solidly filled out in case law. I don't believe making recording glasses illegal to wear in public would withstand constitutional scrutiny. Mandating a visible notification with a conventional color, signaling things like "on" "passive" and "recording" would be constitutional and wouldn't infringe. That said, surreptitious use would likely be legal, e.g. aftermarket modification to allow recording with no lights; first amendment issues have a high bar and all sorts of secret camera precedents being legal. This is how corrupt politicians and cops and officials get caught, all the time, and it's highly unlikely to be smart glasses that gets the people and courts to flip on 1A.