I had the most BIZARRE Experience with my eyes today....

I woke up this morning, read a little in bed, went to my computer and noticed that I couldn't focus well. Then I noticed that both of my eyes (even with eyes closed) see a vibrating band (line) to the left.
I don't know if I can explain it, it looked like a half circle line, and everything in that line was vibrating and moving. I walked away from the computer, I could still see that movement. IT was very strange. Then it moved a little more to the left and in about 15 minutes was gone.
Does anyone know what it may be?
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