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If we have such a high field of vision, why can't we focus on everything within the vision simultaneously?

Why is it that I am not able to read a book without moving my eyes if the entirety of the page is within my field of view? Why do I have to center my eyes on an object to observe it fully? And why is it that I am still able to view changes in surroundings in the edges of my field of vision despite there being supposedly no way to focus on them from that angle?

Is it due to our brain's capacity to absorb a finite amount of visual information at a given moment or is it a physical flaw in the structure of our eyes?

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