When you look at a distant object you can feel your eyes adjust as that thing comes into focus. For example, when I look up from my computer and see a tree in the distance. But, what is happening when you stare at the sky or something incredibly far away that you can’t clearly make out? Does your brain know it can’t “focus” on that and relax your eyes? I guess what I’m asking is what triggers that “focusing” reaction and how does your brain tell the difference?
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What you think you see and what your eyes do are independent. You may think you are focusing on the tip of a pen and that your eyes are perfectly still, but if you record yourself doing it, you’ll see your eyes are scanning all over the place. Each time your eyes move, it’s scanning and contributing an area to the bigger picture of what your brain thinks it sees. The centers of what your eyes look at have higher resolution while further away from the center is lower resolution and optimized for noticing movement. Having a little time for your eye to look at something would contribute more data and hence “higher resolution” to what your brain thinks is there. Think of how easily you can read a piece of paper placed in front of you vs if it flew sideways across your face.
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