Polarising sunglasses have two very interesting effects when used in my aircraft;
1. The display on my KX155 nav com appears to be dead, until I tilt my head to an angle of 70 degrees, whereupon it comes to life again.
2. The windscreen suddenly looks as if it is criss-crossed with millions of spidery, silver crazed lines - which very much spoil the view.
My recomendation would be not to use polarising sunglasses! :-)