Nearby Glasses on Play Store does this

(not affiliated, I did a simple search before writing an app myself)

What if these existed, but Facebook sold them?

Why should the onus be on me to avoid them? I don't want the default to be imagery of myself and family members hoovered up and exploited by an ad company (already made it clear to family that my kids pictures aren't to be shared on any Meta platform). I could even see some reacting violently should they be foisted upon unsuspecting members of the public. It's nothing like CCTV or videos recorded passively on a camera or smartphone which is generally accepted.

And I would like glasses that detect anti glasses wearers

Sorry, wrong comment