I had quite a scary experience today.. as I was watching TV, I suddenly realized that I couldn't see the text on the screen clearly. I started thinking "what the heck is going on?" and waited for a few minutes.
My eyesight started disappearing partially, following a moon-shaped pattern around the center of my eye, and I started getting a bit nervous thinking I might go blind!
We all have a "blind-spot" in our eyes where we cannot see, and what happened to me today was like if there was a big blind spot just above the center of my vision, and it was spreading.
I stood up and walked over to the mirror, and noticed that when looking at my left eye in the mirror, I could not see my right eye!
Looking at my right eye, I noticed that I couldnt really see to the right of what I was looking at..
I started feeling a bit ill, and got a mild head-ache, so I went to bed..
When I woke up about 10 minutes later, for some reason I ran my tongue over my teeth and it felt very weird! I cannot really explain the feeling.. it was like the teeth weren't mine!
Being freaked out by this, I went to the TV and fell asleep on the couch, woke up a few hours later, and the symptoms were gone.
After a swift google-search I found that what I had experienced was a rather common disorder called "Eye-Migraine"..
This form of migraine often starts out with weird patterns, or "Auras", spreading in front of your vision, that usually last less than one hour, and can also include mild to severe headaches. Sometimes, you can also experience numbness (hence why my tongue felt so weird.. it was numb)
So if this ever happens to you, know that it is not dangerous in any way.. but it is quite scary if you do not know what is going on!