You can no longer assume a pair of black-rimmed glasses is just prescription eyewear.

As Meta AI smart glasses grow in popularity and other wearables join the race, they’re facing mounting public backlash over their hidden surveillance capabilities. Smart glasses can record, stream and process video without alerting anyone around them — unless you consider a tiny recording indicator light sufficient.

Broad concerns over privacy have led to a technical battle. On one side, hardware modifiers are tweaking wearable cameras to make them even harder to spot, often by disabling LED indicators. On the other, developers and privacy-focused coders are…

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