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.
I don’t think that is some universal thing at all, because people do wear contact lenses or diving eyeglasses or prescription dive masks.
I think those are for people that normally need corrective lenses (e.g. glasses). Not something special for underwater specifically
EDIT: ah wait I see what the OP was saying… Yeah I don’t think water magically fixes vision problems
OP, have you always been using corrective goggles without knowing?
Also air is not normally a liquid where most people live.
Fluid≠liquid
Air is a fluid; gases & liquids are both fluids
Are we the only two people this works for? I see all the people saying it’s not true, but I have definitely experienced this myself.
It depends on how nearsighted you are. If you have something like -5 you’ll still notice being nearsighted, whereas someone with only -1.5 might suddenly experience seeing perfectly.
It’s because the refractive index of water is different than air. Also, the pressure has an effect on the eye, changing the default focus. Finally you’ll also have a more narrow vision from goggles or from squinting, which itself helps focus ever so slightly.
If you’re in a pool there’s not a whole lot of details to look at to begin with and we’re not terrible good at judging distances under water anyway. So the whole experience is different and difficult to compare to normal vision.
If you do get goggles with lenses you might want to choose a correction that is a few points under your normal glasses because the water gives you one for free.
A factor may be that you don’t see far in water, and details are big (think these black line at the bottom of the pool, not really hard to see)
Attenuation length is shallow water is relatively short, so even with googles and perfect distance vision, you won’t see much behind 10-20m, and may-be 40-80m in deep water (bit there it’s dark).
Mary glasses wearer still have a vision good enough to see decently at 10m especially when they don’t look for ultra small details.
I have astigmatism in both eyes. I can confirm that it doesn’t matter which fluid I’m in, because everything is always blurry without my glasses.
I wear glasses, and if I swim with goggles, everything is blurry.
However, there are some interesting optical things that happen with the water. Between the reduced distance you can see and the funky stuff that refractive indices can do, I can understand it feeling like your vision is corrected.
I have a pet peeve about universalizing one’s personal experience. If I felt like my vision were corrected underwater, I wouldn’t assume everyone else’s was too.
