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Here's an analogy.
Take the cardboard tube from a roll of paper towels or gladwrap.
Hold it up about a foot from your eye and look though it.
Move your eye side to side. You will notice the light passing through isn't cut off immediately your eye is in line with one side (or the other). In fact your eye can be significantly beyond the edge of the tube before you see nothing through the tube. So in other words the useable field of view is significantly wider than just the diameter of the tube.
You're not a bit OCD by any chance ?
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