I have access to various work safety equipment for very reasonable prices. That includes various protective glasses/goggles, face plates etc.
These are standarized according to EN166 norm. Obviously, "F" class, "Low-energy impact, velocity 45m/s" is insufficient.
The problem is the definitely sufficient "A" class (High-energy impact, velocity 190m/s) is mostly restricted to rather expensive and somewhat unwieldy face plates, while "B" (Medium-energy impact, velocity 120m/s) offers a range of very reasonably priced, nice glasses and goggles.
I have no clue how the BB energy converts to these requirements - is "B" class safe enough, or should I choose between "A" and dedicated Airsoft goggles?