How do we have the ability to blur our vision on command?
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in a way, we really don’t.
anything that sees with a lense is gonna have what’s called “focal length”. this is the distance away from the “camera” (in this case your eye) at which things come into focus.
think of depth of field in a video game, where the thing your cursor is over is in focus, but all the background is blurry. that’s a simulation of focal length.
when you look at something, you’re telling your eyes to set their focal length so as to bring that thing into focus. everything else that’s significantly closer or further from you, will actually be blurry (you just dont normally think about it because youre not usually trying to mentally think about those things).
when you “blur” your eyes, what youre really doing is trying to focus on the air that’s right in front of your face. because youre focused on a point closer to you than everything else in your view, everything else goes blurry because its all outside of your focal length.
if you blur your vision and put your hand out in front of you and play with how far away from your face it is, you’ll find that even when you’re “blurred”, there’s a point where your hand finally does come into focus. thats the place your eyes are actually focused on, and when nothing but air is there, you dont comprehend that, since you can’t see air.
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