Need advice, what does it mean when your eye repeatedly twitches and the doctor says nothing is wrong?

Need a little help here. I was reading my grandmothers grimoire, and discovered a page with pomegranate ink all over it (she used this to write things down.) It was on something about when your eyes twitch or ears ring. Of course it was the one thing I needed to know for my niece.

Involuntary contractions of your muscles usually has something to do with your brain or nerves. I noticed occasionally my jaw involuntary bites down every here and there as if I were biting someone. I cannot explain it. If a grimoire is eliciting a reaction where your eyes twitch, maybe there’s a curse laid upon it, or your intuition is trying to tell you something. I’m not that far on my journey into magic yet, so please take what I say with a grain of salt.