Is that true the blind have sharp hearing and the deaf have sharp eye sights? Why?
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"Nimo22" has given you the best answer, so far.
Our senses are what they are. We can do nothing to make our senses any better. Neither can someone who loses one of their senses make the others better.
What we CAN do is to train ourselve to use the information our senses bring to us, better.
Your eysight, for example, brings to you WAY more information than you need, or can even use, at any one moment. Right now, as you read this, on your monitor, you are seeing the background color, the color of the border, the header and all the information Yahoo puts up there. You see the avatars and all the fine print of the other answers and each and every letter of what you have read and are about to read.
But your brain filters out what you don't need to notice. This filtering MUST happen or you wouldn't be able to read anything. If you don't need to "see" the green "ask," "answer," or "discover" header, you won't have to have it cluttering your consciousness until you need to.
All of that information is there, but you don't notice it until you focus your attention on it. This is true of all of your senses. Your ears are picking up dozens of subtle sounds, such as the hum or the air conditioner, the traffic outside, a bird or two, conversations in the next room, even your own breathing. But you don't notice them until you direct your attention to them.
When someone speaks of a blind person having better hearing, that in not what is really going on. What happens is that the blind person is using some of the information coming in through his ears to help him do what his eyes used to. The traffic noises we ignore are what tells him it's safe (or not) to cross the street. We use our eyes. The faint echos from a wall nearby tell him not to run into it. We don't notice those faint echos, because our eyes tell us that the wall is there.
ALL of our senses can be trained to "pay attention" to those inputs that we normally ignore. A deaf person learns to pay attention to flashing light on the phone, while the rest of us wait for the ring tone. The deaf AND blind person learns to recieve and interpret clues from the hands and other parts of the body.
A nearsighted, deaf person will not suddenly improve his vision. He will learn to use his vision more efficiantly.
It's a survival mechanism: since they are missing one of their senses the others become more acute to compensate.
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