Quote:
Originally Posted by Clodfobble
... then I'd cock my head 45 degrees to the side and suddenly everything in front of me would get much lighter and blind me, ...
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I'm guessing the lenses were linearly polarized. I wear only sunglasses with circular polarization with which that doesn't happen. The illumination level through the lenses remains constant with changing viewing angle. They're also photochromic (lighten and darken automatically).