If you’ve ever opened your eyes underwater, you know the world looks like you’re peering through fogged-up glass. Lately, a short video has been making the rounds on social media in which a man (claiming to be a former Navy SEAL) demonstrates a simple “hack”: he presses his palms around his eyes, creates a small pocket, and gently blows air into it. Supposedly, he suddenly sees more sharply—as if he had improvised goggles.
At first it sounds like a party trick at the pool, but in reality it’s very basic physics and eye anatomy. Don’t expect miracles like you’d get with a diving mask, but for briefly bringing details into focus below the surface, it can work surprisingly well—especially in clean water and with calm breathing.
How to make “hand goggles,” step by step
Start simply and without panic—ideally in shallow water where you can lift your head above the surface at any moment. Close your eyes, place your palms so they form the tightest possible “frame” around your eyes (like making binoculars with your hands), and use your fingers to seal any gaps along your cheeks and at the bridge of your nose. Then open your eyes underwater and gently blow air through your nose (or through your mouth in a way that directs air into the space around your eyes) into the little “cushion” you created.
The goal is to create a thin layer of air in front of your eyes. If you manage to hold the bubble for even a moment, the image should be noticeably sharper than when your eye is in direct contact with water. In practice it often collapses after a few seconds because the water finds its way in—but even that can be enough for a quick “what is that down there?” look.
Why we can barely see anything underwater without goggles
The eye is “set up” for an environment where there’s air in front of the cornea. The largest part of light bending (refraction) happens at the air–cornea boundary, which is why the cornea provides such a large share of the eye’s optical power. But when the cornea is surrounded by water, the difference between water and cornea is much smaller, so light doesn’t bend the way it needs to—and the image can’t be properly focused on the retina.
Why even a simple air bubble in front of your eyes helps
Your “hand-made mask” does, in miniature, what a diving mask does: it creates a layer of air in front of the cornea, restoring a strong interface with a large difference in refractive indices. In other words, light starts bending more where your eye needs it, and the image moves closer to proper focus.
Interestingly, while people can improve with training in how much they can “squeeze” out of their vision underwater, without an air interface it’s still limited. A study in Vision Research (Gislén et al., 2006) describes how the human eye loses a large portion of its refractive power underwater, and that high visual acuity underwater is achieved mainly with a mask that reintroduces the air–cornea interface.
What you can realistically expect: sharpness, distortion, and distances
If the trick works, you’ll typically get a sharper image at short range—for example, when you want to find a small item on the bottom of a pool or look closely at a detail on a rock in shallow water. It won’t be as stable as a mask, and it won’t be “HD,” especially if your eyesight isn’t great to begin with. Also, even with a mask, refraction causes distortions in size and distance—diving references note that objects can appear larger and closer (a USC manual mentions roughly “by a quarter”).
With “hand goggles,” distortion is less predictable because the bubble doesn’t have a flat, lens-like shape like a mask. So don’t rely on it for judging distance—treat it as a quick aid for orientation and curiosity.
When it’s better not to try it—and what to watch out for
If the water is dirty or stagnant, be mindful of eye irritation and infection risk—in that case it’s wiser not to open your eyes underwater at all. If you wear contact lenses, the risk of losing them is real, especially if water gets into your eyes or you rub your face underwater. And most importantly: this trick is not meant for deep diving.
As you descend, pressure increases, and goggles that don’t cover your nose can’t be equalized by exhaling into the mask space. Professional material on diving and the eyes (UHMS) warns that swim goggles should not be used for deeper descents because the risk of ocular barotrauma rises significantly. With “hand goggles” you’re not going to get the same suction effect as tight goggles, but common sense still applies: only do this in shallow water, where pressure isn’t an issue and you can surface immediately.
Video: a demonstration of the trick and a brief explanation of why it’s blurry underwater
Here is a short demonstration of “hand goggles” (short).
And here is a popular explanation of why we see blurry underwater without goggles (reflection and refraction in practice):
Summary: a small physics hack, not a replacement for a mask
“Hand goggles” aren’t magic—just a simple use of the fact that the eye needs an air interface in front of the cornea in order to focus properly. If you create that layer of air, even briefly, with your hands and a bubble, your vision can noticeably improve. But it only works temporarily, in clean and safe conditions, and especially in shallow water—a mask or good-quality goggles remain the best and safest choice.
Sources
- Diving Medicine for Scuba Divers (chapter on vision and light refraction in water) — https://dornsife.usc.edu/hyperbaric/wp-content/uploads/sites/49/2023/10/Diving_Medicine_for_Scuba_Divers_sm-compressed.pdf
- Cornea (Duane’s Ophthalmology) – the cornea’s optical power and underwater blur without an air–cornea interface — https://ophed.com/system/files/2010/07/cornea-duanes-ophthalmology-2337-2337.pdf (ophed.com)
- Diving and Hyperbaric Ophthalmology (UHMS) – pressure risks, goggles vs. mask, and ocular barotrauma — https://www.uhms.org/images/MEDFAQs/September-2016/Diving_and_Hyperbaric_Opthalmology.pdf
- Visual training improves underwater vision in children (Vision Research, 2006) – limits of human underwater vision and the importance of the “air–cornea interface” — https://local.psy.miami.edu/faculty/dmessinger/c_c/rsrcs/rdgs/perception/gislen.2006.1-s2.0S0042698906002367-main.pdf (local.psy.miami.edu)
Jana
I like turning curiosity into words, and writing articles is my way of capturing ideas before they slip away — and sharing them with anyone who feels like reading.
