I think you mean attention. Physically your focus is pointing toward something with great detail, but mentally you can concentrate on something else that is in your span but where your eyes arnt looking at directly. The part that you are concentrating at is in peripheral vision, not in the middle. Do you mean this?
Or do you mean you can focus your vision on something with great detail thats not in the middle of your vision?
It isnt possible to do it in such a great detail like in the middle of the vision, but i think your brain can make it to an illusion.
Its not about seeing its about recognising. When do you concentrate on something at the peripheral vision you could think you would better see it, you would get an focus. But that isnt real its only because you are concentrating mentally on it and you begin recognising things that arnt well seen. Because of recognition you are now seeing things at this object, your brain now fills your "picture" with details,
because it knows that they are logically a part of it. It reconstructs your vision and fills the blind spots with known components that are logically a part of that object, the big picture. I could imagine it would give you the feeling of sharpness.
Normally its the other way around, but i think with the most things in reality its bidirectional.
Edited by scitris, 30 June 2014 - 11:57 AM.