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This App Warns You if Someone Is Wearing Smart Glasses Nearby - 404media
(www.404media.co)
This is a most excellent place for technology news and articles.
Presumably the sensor's data lines would be detectable, but probably more like laboratory conditions.
Perhaps a physical shutter would be a good happy medium. Put 'em on the damn cell phones, too.
Shoot, I should 3d print one for mine. I don't use my camera for much anyway, and better protection from impacts would be nice.