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The Z87.1+ high velocity test is a 1/4" steel ball at 150fps, which after some math is actually quite low in impact energy.
But if it survives a steel BB at 150fps, it'll sure as hell stop a 6mm plastic BB that deforms on impact.
That being said, I'd much rather only use mil-spec rated lenses since they're tested to significantly higher standards.
Remember you don't want your glasses to be rated to 1.6j (420fps) and you don't want them rated to 2.1j (475fps), you want them rated to the highest fps within common sense that could plausibly be on the field, which would be a GBBR on a hot day around 3.3j (600fps)
Just because you have limits in place, and guns are tested, doesn't mean it's impossible for a hot gun to make it on the field. Either by direct cheating or someone doesn't realize a GBBR gains energy as the temperature goes up, or a unknowing admin tests the GBBR at 400 with a .20 and that player goes on to use .30s.
I've been shot in the glasses by a hot GBBR from not very far away, and if it can happen to me, it can happen to you. Just glad I was wearing mil-spec lenses. Although just because your lenses are rated to Z87.1+ doesn't mean they can't take a higher impact, better safe than blind!
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