Here is an interesting read, albeit American based.
https://blog.safetyglassesusa.com/how-to-identify-ballistic-rated-eyewear/
http://the-lowdown.smithoptics.com/content/guide-ballistic-eyewear
"Ballistic Eyewear Ratings:
The American National Standards Institute (ANSI) tests ballistic eyewear with projectiles traveling at 150 fps (feet per second). Glasses and goggles that pass this testing are given the rating, ANSI Z87.1+ and are suitable for civilian or industry use.
Civilian eyewear that meets a Military Specified impacts (MilSpec) generally meet the ballistic characteristics clause of MIL-PRF-31013 (glasses) or MIL-DTL-43511D (goggles). For the US military, ballistic eyewear worn for duty must meet the MIL-PRF-32432 Military Combat Eye Protection Standard (MCEPS). Tests involve subjecting eyewear to small metal balls traveling at 650 fps (glasses) and 550 fps (goggles)—more than four times the speed of ANSI Z87.1 testing. Additionally, military eyewear must have UV protection, a comfortable fit, chemical resistance, and environmental stability (resistance to extreme temperatures and environmental changes).
US military-approved ballistic eyewear is listed on the
Authorized Protective Eyewear List (APEL)."
And then this from Wiley x
EN.166S (Safety glasses):
Frame and lens must withstand the impact of a 22 mm steel ball weighing 43 grams dropped from 1,3 meters at a speed of 18 km/h. The lens must remain in the frame and is not to shatter. The frame must remain intact as well.
EN.166F (Safety glasses):
Frame and lens must withstand the impact of a 6 mm steel ball weighing 0,86 gram fired at 162 km/h. The lens must remain in the frame and is not to shatter. The frame must remain intact as well.
EN.166B (Safety goggles):
Frame and lens must withstand the impact of a 6 mm steel ball weighing 0,86 gram fired at 432 km/h. The lens must remain in the frame and is not to shatter. The frame must remain intact as well.
Interestingly 162 km/h = 147.63780 Feet per Second where as 432 km/h = 393.70079 Feet per Second but the bearing is made from steel and not what we use for Airsoft.