The image of an object seen by a short-sighted eye is fuzzy because, this eye being longer than the normal, the image is formed in front of the retina.
On the other hand, the short-sighted ones see Net of near without correction when they bring the object closer to the eye.
The correction of Short-Sightedness is done by glass or a lens of divergent contact. One can obtain the same optical effect while flattening with the laser or by any other surgical means the center of the cornea.
Short-Sightedness is increasingly frequent for reasons related on heredity and the environment