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Infrared contact lenses let you see in the dark
(arstechnica.com)
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this post was submitted on 22 May 2025
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Phone cameras have very good IR filters. They aren't perfect which is why they can still see the LEDs, but they aren't anywhere near as bright.
I have an old RasPi camera with the IR filter removed, a remote control looks like someone used an old-school camera flash in pitch darkness. Which is how you can control your TV sometimes even from the next room over - especially at night with no ir from the sun - shine the remote at the wall, and the wall blinks bright enough for the TV to see it, often even after a few reflections.