Under Water
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How come when you open your eyes under-water everything is blurry?
Ever Since i was little, I have been opening my eyes under-water. But I recently started to wonder, How come its so blurry under-water. With goggles it clear, but goggles give me headaches and stretch my skin. Chlorine doesnt bother me. But how can I get better vision under-water? What causes it to be blurry?
Emily is right but she's wrong. She's right in that the reason it is blurry is because you are looking through water. BUT, it is not for the reason she says. It has nothing to do with looking through the water or that the water is moving. It's because the water is actually in contact with the front of your eye. (That's why you can see quite clearly underwater if you are wearing a scuba mask. With a scuba mask you are looking through the water and the water is moving. But your vision is still clear.)
The eye is designed to see clearly and focus light directly on the retina when light enters the eye after traveling through air as it contacts the front of the eye. Since water and air have two different indexes of refraction (they affect light differently) light that enters the eye after traveling through water that is in contact with the front of the eye will be focused very differently than if the light contacts the eye having traveled through air at the point of contact. Again, that's why you see clearly underwater with a scuba mask on. And it doesn't matter how far it travels through air before it strikes the front of the eye. A fraction of an inch is enough to allow the image to focus well.
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