The best example I have is, sitting in your car and there’s a spot/drop of water on your windshield. Say you’re looking at it but you can easily and consciously “zoom out” to beyond the windshield and look at the tree in the distance without moving your eyes. Are your eyes physically moving? Or is it a mental thing that changes your focus
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[Your eye has a flexible lens in it.](https://webvision.med.utah.edu/wp-content/uploads/2017/08/Fig-1a.jpg) There are muscles in your eye connected to that lens that can contract or relax it, changing how light focuses. When you “zoom in/out”, you’re really just refocusing your lens to make it easier to see different distances.
Extra note: As you age, that lens starts to stiffen, making it harder to focus on things close to you. This is why people tend to need reading glasses as they age
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