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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If they could be made to fit on my current glasses, I'd be glad to buy a pair. Standard sunglasses seem never to be the shade I want.
First thought: Weight. As a wearer of glasses for many years, one thing which is really sensitive to the fit, comfort and convenience is the weight. Heavy glasses tend to glide down the nose and uncomfortable. These look like they could be heavy. Second thought: Clumsy. They look really, really clumsy. Just a few mm's difference on a frame thickness makes a lot of difference on the look and these look kinda heavy handed.
How very steam punk!
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!