Why Do Things Look Blurry Underwater?

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From SciShow.

If you’ve been brave enough to open your eyes underwater, you might have noticed that everything is blurry. But fish have no trouble finding their way beneath the waves. So why can’t we see as clearly below as we do above?

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Sources:
https://www.researchgate.net/profile/Lars_Gislen2/publication/8186298_On_the_optical_theory_of_underwater_vision_in_humans/links/5e6fb01c299bf12063f7df78/On-the-optical-theory-of-underwater-vision-in-humans.pdf
https://dx.doi.org/10.1016%2Fj.semcdb.2007.10.011
www.britannica.com/science/human-eye
https://books.google.com/books?id=uXSK6hDKFC0C&lpg=PP1&pg=PT84#v=onepage&q=semi%20aquatic&f=false
https://courses.edx.org/c4x/MITx/9.01x/asset/fish_lens.pdf
https://www.nature.com/articles/435157a
https://anatomypubs.onlinelibrary.wiley.com/doi/pdf/10.1002/ar.20529
https://www.sciencedirect.com/science/article/abs/pii/S1367048418310452

Image Sources:
https://www.storyblocks.com/video/stock/sparse-blue-soda-bubbles-background-with-loop-h9igreajeiupxpqrc
https://www.storyblocks.com/video/stock/very-cute-blowfish-in-the-water-sauveai7sjz52rfsq
https://www.istockphoto.com/vector/flashlight-vector-icon-gm942727746-257630098
https://www.istockphoto.com/photo/blue-glass-gm471391755-20118037
https://www.istockphoto.com/vector/realistic-human-eyeball-eye-retina-structure-round-iris-texture-anatomy-object-gm1254563147-366726080
https://www.istockphoto.com/vector/brain-anatomy-vector-gm1162837999-319109740
https://www.istockphoto.com/vector/question-mark-icon-on-black-and-white-vector-backgrounds-gm832138684-135394135
https://www.storyblocks.com/video/stock/a-view-up-to-the-ocean-surface-from-deep-underwater-hh7rfzgp8k8ha2v7f
https://www.istockphoto.com/vector/climbing-perch-published-in-1868-gm482329992-70159631

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