Eli5 why do wee see things we dont focus on blurry ? Why cant our eyes see everything sharp ?
In: Biology
It’s because the pupil of your eye is not infinitely small. This means that one side of your pupil is seeing the world from a slightly different point of view than the other. The lens of your eye can correct for the difference, but only for objects around a certain distance away.
In dim lighting, your pupils are large and this makes more things out of focus; photographers call it having a shallow depth of field. Outside, on a bright sunny day, your pupils shrink and much more of the world can be in focus at the same time. A pinhole camera sees everything in focus, at the cost of only having very dim images.
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