Non lethal rounds means that whatever they're shooting will hurt you but won't kill you. So the projectile is moving slow enough that safety glasses would actually protect your eyes.

If they are shooting anything stronger then they are using lethal rounds that could go through your skull and no safety glasses can protect you from that.

The thing here is to protect your eyes ... they don't care if they blind you, to them they can say that they didn't kill you. But I really don't want to see any young person lose an eye to any of this stupidity.

Wear safety glasses ..... if you save your eyes, you can go out there and join movements longer and more often. If you lose an eye or go completely blind, you will wonder about everything you did.