You can see everything at once. However, you can’t “focus” as in mentally acknowledge what you’re not looking at.
For example, look at this **DOG**. While staring at that word, can you read the paragraph above? It’s very difficult to do this.
I think that’s what you mean when you say “why can’t our eyes focus on everything at once”. The answer to that question is because your brain will ignore information that it seems unnecessary. It is not necessary to read the paragraph above when you look at the word **DOG**, and so your brain will not process the words above into thought.
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