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How come do we see neatly without correction under water? (lemmy.world)

submitted 1 week ago by BeatTakeshi@lemmy.world to c/asklemmy@lemmy.ml

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When snorkeling, scuba diving, or just swimming with goggles, you don't need corrective glass, why does water do this and not air? Both are transparent continuous fluids.

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[–] Kache@lemmy.zip 7 points 1 week ago (1 children)

OP, have you always been using corrective goggles without knowing?

[–] BeatTakeshi@lemmy.world 1 points 1 week ago* (last edited 1 week ago)

Absolutely not, I got them in a retail shop. I do not see clearly beyond 50 cm without glasses. I could definitely see crisply a jellyfish on the seabed, probably 3 meters below. I watched a dead jellyfish once at my feet on the beach, and I had to crouch to actually see what it is. I see from the comments it's clearly not working for everyone, so maybe only myopia rather than farsightedness, and maybe to a certain degree only