They need to be ANSI Z78 spec at a minimum, IMO. They list a 100mph impact for that particular item- that's great, what was the projectile? Was it a pea, or pea stone?

I just looked up the standard:

Requirement: Spectacles shall be capable of resisting impact from a 6.35 mm (1/4 in) diameter steel ball traveling at a velocity of 45.7 mps (150 fps). For sample size of 20, no failure may occur.

That is a piece of gravel being tossed by a car at non-highway speeds. Or a slingshot's ball.

I would say that if they don't have the ANSI spec on them, and it should be marked on the goggles themself, it doesn't meet the requirement or the manufacturer hasn't bothered to get it certified. The cost of getting the product tested is small compared to the number of customers who will look at it, not see the ANSI spec and pass on it, that I can't imagine NOT getting the testing done.

Polycarbonate means any thickness. An inch of polycarb is able to stop a decent rifle round, but it is chemically identical to my Nalgene bottles which won't stop a bullet, and to my glasses, which are ANSIed. It's like saying steel- 4 inches of steel stop a LOT more than say, .4 inches. And it isn't a linear relationship.