they were developed by NASA in the form of space helmets, so that when astronauts were mining on the moon they could see what they were doing and not have their vision messed up by scratches. This...
Polaroid lenses filter out light in a single plane - this includes light which has been reflected off glass and water (you can see this effect with a polarising filter on a camera). This means that...
the color of the lenses doesn't matter. It's the amount of protection on them. Often there is a sticker on the lens when you first buy the sunglasses that will tell you the amount of protection they...
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