I've heard people complain about the lights before, but have no idea what they're talking about, my dentist uses these lights that seem very directional, they d

I've heard people complain about the lights before, but have no idea what they're talking about, my dentist uses these lights that seem very directional, they don't shine on my eyes at all, I just need eye protection from stuff that gets flung out of my mouth while they're doing there work.