Lost vision in left eye for 45 minutes. What happened?

Question

Today, I felt kind of funny and got a weird headache. I realized that I could no longer see the face of the person I was looking at. For about 45 minutes, I had a "hole" in my vision in my left eye, like there was a white spot or "nothingness" there. I also had a headache.

Other details: I had drank an ice coffee which used to give me panic attacks. I wear glasses and have been diagnosed as pre-glaucoma but have been fine. Healthy otherwise. It was also raining today and maybe my glasses got drips on them and I strained too much? Does anybody know what happened? It went away as suddenly as it came, although I still have a headache. My doc said to go to the ER if it happens again.

Answer 1

That has happened to me before and I usually find it happening when I didn't get enough sleep or if I didn't eat enough.

Answer 2

Possible migrane. There are reports of vision loss or cloudyness in one eye before a migrane hits.