Pedota, sensible thinking. My ex-boss used to get his sunnies from, I think, Worksafe Australia?.. something like that anyway. He never paid more than $20; if your sunnies are a fashion accessory you put on top of your head when cruising the bars in uniform looking for chickies, look elsewhere, but if you want effective and cheap protection that meets all the standards, they are worth a go.
As far as polarisation goes, many moons ago when I was first starting in Brisbane Tower and was suspicious of all sunglasses-wearing controllers as posers, I was having difficulty spotting a lightie on left base for 04; training officer said, "put these on" and gave me a pair of polarised sunnies. There was the Cherokee, like the proverbial dog's gonads against the blue sky; I was immediately converted. But when the polarised sunscreens in the tower are down, forget polarised sunnies! Horses for courses.
Binos