1) Face shield, or goggles if you don't have a face shield
2) a GOOD dust mask under the face shield. - you don't want Black Lung disease
If you don't have a Fage Shield, make sure your goggles fit well with that dust mask - NO GAPS.
Even then, look out. I wiped the sweat off my brow after grinding a new chisel, and a flat chip of steel found its way from my glove to my eyebrow, and then into my eye! No damage, though. A cheap but permanent lesson. If I have to wipe my face, I reach for a clean cheap hand towel I keep in the filing cabinet under my bench. Not even the wood dust gets in there.
I always keep a good medical kit handy in the shop. My wife is disabled & can't help me much with an injury, so I know I'm on my own.
Just like a motorcycle - stay scared & you stay safe.