Polarized lenses or not?

[COOLMACHINE]

Another thread made me think of this tidbit of info regarding polarized lenses. How to tell if a pair of sunglasses are polarized or not.
If you have one pair of polarized sunglasses, you can test to see if any other pair of sunglasses are polarized or not.
Simply look through the pair of polarized lenses, then put the questionable pair in front of those and peer through both sets of lenses at the same time. Now turn the questionable pair 90 degrees. If the lenses turn dark, the questionable pair are in fact polarized as well. Jerry

 

[scudrunner]

You don't need another pair to test for polarization, just do the same with glare on a window, or looking at the blue sky. If the color changes or the glare goes away, they are polarized.