I see what you're saying. When I say not common, I mean I trust that it's not common or likely for a doctor to secretly use a phone or other hidden camera, whatever method that may be, to record, not that the phones themselves are uncommon.

I think one big difference between the two is I trust my doctor, but if they walked in with a recording device on their face I would immediately lose all of that trust even if they said it wasn't recording. If I saw my doctor walk in with their phone camera exposed, I would also have concerns, but less than the glasses, mostly because the glasses have one function, and that's recording. Seeing a phone would mean there could be malicious behavior, but not necessarily. It would be something that I would bring up if noticed.

At the end of the day, you have to have some level of trust or you'll go crazy. It's easy to trust that your doctor isn't secretly recording you, but not so much when they're exposing the camera to you.