You've only got ten fingers (or eight and two thumbs) and they won't grow back if you lose them.
So stop lying to yourself, it is simply not enough to do the 'safety squint' in order to protect your eye/s from splinters, sparks or anything else that's flying around on site or in the workshop. You've only got ten fingers (or eight and two thumbs) and they won't grow back if you lose them.