Smart glasses look like regular eyewear, which is exactly the problem. Someone standing next to you on the subway or sitting across from you at a coffee shop could be recording video without you knowing. The technology is subtle enough that most people don't realize they're being filmed until it's too late, or never realize at all.
Meta Ray-Bans are the most common smart glasses currently available. They're widely accessible and capable of capturing photos and video with a simple voice command or button press. The frames look like slightly chunky Ray-Ban Wayfarers, and unless you know what to look for, they're easy to miss.
