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Why the devers keep air around the Cornea by wearing a face mask? explain briefly

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The main reason why you want to keep air around your eyes is because corneal function is degraded severely in water.  It also helps to be a little more comfortable as many people don't like the feeling of having their eyes underwater.

The main problem is that the cornea and the water have similar densities so that instead of a great deal of deflection and focus taking place as the light rays pass from the air into the cornea and then onto the rear lens of the eye, the light is hardly diffracted at all, leading to a complete inability of the eye to focus in a normal way on what is being looked at.

So hopefully that answers your question about "divers!"

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