Goggles or mask for snorkeling?
Wednesday, March 10th, 2010I’m shopping for inexpensive eye wear and a snorkel (fins to be rented on site). Can I just get pool-style goggles instead of the bulky mask? Is it that important to have my nose covered?
If you just stay on (or not far below) the surface, you could get by with goggles. However, I think you may have problems with leaks if you attach a relatively heavy & bulky snorkel to the swim goggles. Swim goggles seal over a relatively small area compared to a dive mask, and part of the sealing mechanism is the tightness of the strap. A well-fitting dive mask will create a seal pretty much regardless of the strap tightness, and the strap is there mostly just to keep the mask in place.
When it comes to breathing, as long as you can focus on breathing exclusively through your mouth you shouldn’t inhale water through your nose. If you’re not used to breathing through a Snorkel or regulator, though, you could have a tendency to inhale some water wearing goggles. With some practice this probably wouldn’t be the main reason you would choose a mask over goggles.
Where a dive mask is absolutely necessary instead of goggles is if you plan to hold your breath and dive to any significant depth below the surface. I’m afraid I don’t know what that exact depth is, but 20 or 30 feet seems like a reasonable number to guess at. Both dive masks and goggles allow you to see better underwater by creating an air space around your eyes which allow your eyes to focus (without a mask everything appears blurry underwater). Air, like any gas, is compressible meaning as you apply pressure to it it will compress into a smaller volume. As you dive under water, the weight of the water above you applies pressure to air spaces in and around your body, which includes your goggles and mask. (As an aside, this is why you feel pressure/pain in your ears if you dive deep enough underwater since your middle ear contains an air space.) As the air around your eyes compresses it takes up less volume and since nature abhors a vacuum something else must give to try to replace that volume…which ends up being the soft tissues around and in your eyes. The result is what we call a "mask squeeze". Here is an image of a classic example of a mask squeeze: http://www.bsac14.org.uk/photo/masksq2w.jpg . While it looks terrible, it is usually a minor injury and will clear up on its own like any bruise. There is no permanent damage to the eye as long as the redness is limited to the whites of the eyes and does not affect the irises (colored portion).
The reason that a nose pocket exists on a dive mask is pretty much just so that the air space inside the mask can be equalized with the water pressure outside the mask. This is done by exhaling a little air into the mask through the nose. Equalizing the pressure is what prevents a mask squeeze. Since swim goggles have no nose pocket, there is no way to equalize the pressure inside the goggles and so a mask squeeze cannot be prevented.
Anyway, even if you don’t intend to do any significant breath-hold diving, I think you will probably be better off with a well-fitting dive mask instead of goggles because of the leak risk. The whole purpose of snorkeling is to see what’s below you, and if your goggles should leak all the time you won’t have much fun.
Good luck with whatever your choose!


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