alt Hacker NewsThe relevant legal provision is from §8 TDDDG [1]:
"(1) It is prohibited to possess, manufacture, make available on the market, import, or otherwise bring within the territory to which this Act applies, telecommunications equipment that, by its appearance, purports to be another object or is disguised as an object of everyday use and that, because of these circumstances or because of the way it functions, is particularly suited and intended to intercept, without that person’s knowledge, the non-publicly spoken words of another person or to record images of another person without that person’s knowledge."
IANAL, but this sounds like it's directly applicable.
Violations can be punished with up to two years in prison or a fine.
Glasses that record video have been around for decades, they just weren't as pervasive. It sounds like this is a general law against disguised surveillance cameras, which I'm sure has historically included camera glasses, so it seems like kind of a slam dunk unless Meta can somehow argue that smart glasses have become common enough to be readily recognized as a recording device.