Are you aware that polarized glasses can wear out, this will render them useless, you can do a quick check, put on your glasses and then hold another pair in front of them with the side frame pointing away from you, you should now be looking through two pair of glasses, at this point close one eye and turn very slowly the pair of glasses in front of you, what should happen now is they should darken to a point where you can't see through them, if there are clear patches, then chuck them in the bin, they are worn out.
I have bought expensive ones in the past, but now i find SOME of the cheaper ones are just as good, shop around, try Boots the chemist.
Good luck.
Brian.
ps. ...............it's the old ones that you should be holding for testing.