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The refractive index (how much light is bent) between air and the cornea of the eye is different from that between water and the cornea of the eye. The corneas of our eyes are curved by the right amount to allow images to be properly formed on our retinas - that is considering an air to cornea interface. The corneas of fish curved slightly more to compensate for a water to cornea interface so they get clear vision while under water. (Actually it is our eyes that compensate as the water eye came first).

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