There's a sense of tension that lives inside Kassy Zanjani when she's on the street or at a café — and especially if a stranger approaches with a smile and what seems like a harmless compliment.

She's on alert, asking herself the same question: Is someone filming me?

That feeling is called hypervigilance — essentially, it's your nervous system trying to protect you from an outside threat.

It's common among veterans, soldiers and first responders, but it began for Zanjani in January, after learning a stranger had secretly recorded her using smart glasses and uploaded the video to Instagram and TikTok, where it amassed more than 30,000 views in the span of a week before a friend alerted her.

*** The article offers at least a partial solution ...

In February he launched Nearby Glasses, an app that scans your surroundings, to a range of about 10 to 15 metres, for Bluetooth low-energy signatures, a feature of smart glasses.