Here is a post from an old thread, it goes into details about an almost opposite question. Someone wanted some lenses for airsoft that also met Z87.1 (thats prety much your standard safety glasses, deffinately not safe for airsoft, likely couldnt survive 1 point blank shot, or even 1 at 50 feet and for sure not multiple hits. What you really want/need for airsoft (unless your playing at a PB field) Is something with the MIL-DTL-43511D those will stop multiple strikes with real ammo, and fragmentation devices.
Originally Posted by Firewalker
ANSI Z87.1+ rated eyewear is not rated for paintball or airsoft. It does not meet the requirements of multiple strikes. I don't know why you would need that.
This means a ton of paintball eye protection won't have ansi rating because ansi ratings mean nothing when it comes to paintball masks. This shows that the host is just slapping a label on something because they think it's safe.
Most eye wear used in airsoft has to meet the MIL-PRF-31013, clause 184.108.40.206 for glasses or MIL-DTL-43511D, clause 3.5.10 for goggles as these are the only ratings that use multiple strikes. Most ballistic eyewear (wiley-x, revision, ess, etc) surpasses theses military standards.
And here is the thread for reference.