I don't use my bench grinder for much other than sharpening or cleaning tools, I have a belt grinder that I use and I wear a full face mask when I use it. the angle grinder is where I often just wear the glasses if it is going to be a short job, the other day I was using a cutoff wheel and had it come apart, a shard went by and hit my cheek (I had the glasses!) I was lucky it didn't cut me.

Red