Neutral density (ND) filters are used by photographers to stop down the amount of light entering the camera lens. The filter is actually two layers that are polarized; rotate the outermost one, and the admitted light is reduced or increased.
A startup called Lombell figured it would be a good idea to put this arrangement into a pair of sunglasses:
While I can appreciate that this must've sounded like a cool idea, wouldn't the UX suffer, since each lens needs to be adjusted independently? I've never tried these, but unless your eye can easily detect between F-stops, I'd guess you have to take the glasses off as you dialed them to ensure symmetry.
If this is you, these are $90.
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Corbu sunglasses
I'd love this! I had a migraine the other day and I brought my sunglasses into work. They're very light, supposedly even transition to a darker shade of brown when bright light shines into them, that's yet to be seen. But I put them on, and my monitors go dark. They're polarized the wrong way. I sat there and thought how can I get the polarization to rotate 90° without having to lean my head over. Problem solved!