Are you going a little deeper than usual on your flip turns? Sounds like what happens if you try to swim underwater with goggles on. Even swimming underwater at very shallow depths can cause this, because unlike a diver's mask, you aren't able to blow air into the goggles to reduce the pressure on your eye sockets. If you weren't swimming underwater, then loosening the strap just a little will probably help. But don't loosen so much that the goggles leak.




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