I think I'm a pretty cautious person when workng in the shop but I've blasted my eye twice with the exhaust air from my nailer. After I did it the first time I thought, "I'll never make that mistake again." But I'm so wrapped up in the business end of the nailer that I let it happen a second time a week later. Maybe I'm this week's poster boy for eye protection? It doesn't hurt. But the blast of air opens up both eyelids like parachutes which lets in a lot more light... so it's quite a stunner. Needless to say I'm going to wear goggles every time from now on.