I had the same kind of experience but with only half of my vision. I could only see half of a page on a book or half of the room I was in, it didn't last long but it was scary. Went to the eye doctor and he said I had an ocular stroke and was lucky that the clot kept on moving, sent me to a cardiologist and I am going through lots of test now.
2 years ago my eyes pixelated. I couldn't see anything it looked like I was looking through a kaleidoscope, lasted an hour. They called that an ocular migraine. Really interesting what new things are happening or happening to me any way. Lets all pray that it doesn't happen again.