Eye protection products for airsoft should be able to withstand impact from a bb shot from any angle, at any range, from the fastest gun allowed on the playing field. There are documented cases of accidental eye injury occurring, even on organized fields, within an arm’s reach. There are fields allowing sniper rifles firing up to 550 fps. That is why Dr. Airsoft testing is done with fast firing rifles at point blank range. Eye protection products which can keep a bb out under these conditions are appropriate for use while skirmishing.
Some tactical goggle manufacturers recognize that most goggles are vulnerable to penetration where the seal of the goggle passes over the bridge of the nose, between the eyes. Most (if not all) goggles that do not cover the front of the nose and can allow a bb to pass between the side of the bridge of the nose and the goggle seal to strike near the eye. I have found this to be true on testing. Many lower facemasks do a good job of protecting against such intrusion.
The ASTM currently has a standard for airsoft eye protection under development.
Index of Airsoft Medicine eye protection testing videos: