Peripheral vision. While this can be normal if it happens for a few minutes at the end of extreme exercise, most of the time it is abnormal. Serious conditions like glaucoma and retinal detachment can cause this. See a specialist eye MD and get checked out.
Depends. It could be a type of a migraine headache even if you do not experience the pain. I would however have it checked out by your doctor. Does aleve, (naproxen) aspirin, excedrine or Ibuprofen help?