Myopia or short-sightedness makes it more difficult to focus on more distant objects.  It is a very common condition; typically its onset is either when young, but sometimes later in the twenties.  There is considerable debate about whether myopia is inherited or whether it is exacerbated by doing excessive close work.  There are a number of treatment options for myopia, including spectacles, soft or hard contact lenses, orthokeratology and laser refractive eye surgery; some or all of these may be suitable for you.