DuckDuckGo made sunglasses that do absolutely nothing, and they sold out
https://www.techspot.com/news/113357-duckduckgo-made-sunglasses-do-absolutely-nothing-they-sold.html
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· in reply to @filcuk@feddit.uk
I believe the Facebook glasses do have this.
The problem is just that the light is rather easy for an end-user to remove. And that it may be too dim to clearly see in brighter situations.