Shooting without eye protection on to "simulate reality" is just about the stupidest thing I've ever read, and I don't care who wants to argue about it. There is probably not an Instructor in the world who does more "real life" training than Henk Iverson does, and eye protection is manditory on his range - even when he trains SF.
Others may do as they will, but NO student or observer will ever be allowed on my range without eye and ear protection - the end.
Frank Sharpe
Fortress Defense Consultants
This. In addition, back in the day, I was involved in some training while in the military, and we ALWAYS wore eye and ear protection.