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Women in Brussels 'filmed without their knowledge' by men wearing Meta smart glasses
(www.brusselstimes.com)
This is a most excellent place for technology news and articles.
there are open source android apps that tell you when a meta rayban is nearby (using the phone's ability to scan nearby bluetooth devices) which isn't really good enough but it's something i guess
https://github.com/yjeanrenaud/yj_nearbyglasses
if you're a woman and the creep is a man, there's always the option of pepper spray i guess, though then you will have to justify yourself somehow. i don't think predominantly male chud cops will accept the reasoning of "i feel unsafe" from women, even if it's true and valid.
as for impractical ideas, you can always carry around a 5W laser pointer and then try and fry the camera. of course does not work irl.