Thank you very much for your reply.
But I'm not sure that we are on the same page. I mean when I look to the side or up, I will see that circle. But when I move my eyes to the normal position, it will disappear and I won't see it.
Not for certain, but it sounds like it's a symptom of squinting. Try not to squint. If you must squint, then you need glasses for refinement of your vision (or Lasik) or sunglasses.
Sincerely,
Timothy D. McGarity, Medical Doctor, Ophthalmologist