How Can I Tell if My Lenses are Polarized?

The best way to tell if your lenses are polarized is to start by holding one lens in front of the other so that they are parallel. Then while looking through the back of both of them, rotate the lenses back and forth between 0° and 90° angles. If the lenses are polarized, they'll darken as you rotate them.

Want to learn more about how polarized sunglasses work?