Just a note on this, there IS a standard for Paintball eye protection and the basic impact rating for Z87.1 should be more than adequate for our purposes too.
(from another forum discussing much the same thing)
Z87.1 alone is not the standard for paintball.
Its a subset, and covers part of the standard, so it doesn’t fit that of its adequate for Paintball then it’s adequate for airsoft
There have been a couple of recent threads on standards for eye protection. Impact is one factor and a key part of manufacturers not stating their protective glasses are suitable for airsoft is that impact protection in itself is not enough
Its generally accepted that glasses with the right impact level are good for airsoft, but there remains the possibility of indirect shots getting in
In Paintball the lens must have the appropriate impact protection, seal the area around the eyes to give combined eye protection then the paintball standard also includes face and ear protection, the goggle straps and the chin strap
Chin straps came to the fore in recent years with a few incidents, particularly when a player was stabbed in the face with a barrel when his goggles were flipped off his face. This caused international outrage (99% American outrage) that the existing chinstrap rule to meet standards was enforced with blame being attributed to the field layout and a large bunker - its true that this was the cause of the accident, but if the goggles were worn properly then they would not have come off
The chin strap rule has again been disregarded and forgotten
Other things that are thought to be safe can be the opposite. It’s become trendy to wear double straps, a couple of designs have two rear straps and others add them for a stronger hold or because a ‘pro’ wears them that way so it must be cool
The problem with doing it badly is the second strap if in the wrong place on your head it adds tension and pulls the goggle up and off your head if it’s knocked etc
Note that in addition to ANSI being American, ISO is international and EN European.
But neither ISO or EN standards are valid in the UK until ratified to a BS standard
Thus we have BS ISO xxx, BS EN xxx etc