Not have tested them, yet, but typically, all standard safety glasses are from the same material (PC - Polycarbonat). Even with direct hits, it is almost impossible to break that material (for normal users). If I remember right, JörgS even had a video where he tried to get through a police riot shield, which is made of PC. Also, a lot of commercial sunglasses are made of PC, so in my opinion, Dräger schould be fine.
OK, there are some guys out there where even safety glasses would not help in case of a RTS, but I guess, also glasses according to ANSI or ISO will not help a lot.
Update: Depending on the price difference, you can buy 2 glasses from Dräger and give one of them a direct shot with your SS. A direct shot would be the maximum impact energy that could happen when shooting a SS.
Last edited by JanP; 03-19-2017 at 11:03 PM.