I've recently bought a pair of oakley's Jupiter squared with black iridium polarized. i love the sunglasses but sometimes i get a slight headache after wearing them for a long time, i noticed the lenses are polarized diagonally yet not in the same direction. each lense is 90 degree to the other, which might be the reason of the headache .. is that how it's suppose to be or should i get them back to the store from where i got them?