I had the same prob a few yrs back when i was grinding some carbon steel tubing. I had shield on but when i would lift shield up the shaving would fall back onto my forehead and into eyes. After a lot of irritation I also went to doc and he plucked and drilled all shavings out of both eyes I had patches on both eyes for 2 days blind as a bat. I would prever if doing alot of grinding underneath use goggles and shield. I know its uncomfortable, but hell it will save the doc visits and alot of pain..