Long-sightedness or Hyperopia, is the condition in which close objects appear blurry. A longsighted person may have good distance vision but will have trouble with close objects/detail.
With hyperopia, light entering the eye focuses in behind the retina. This occurs because either the eye is too short (in length), or the focusing components of the eye are too weak.
A diagram of a normal eye v a longsighted eye.
As you can see, in the diagram of the normal eye, light enters the eye, and focusses perfectly onto the back of the eye (the retina). With a longsighted eye, the light focusses in beyond the retina, and causes the image that forms on the retina to be blurred. This causes near vision to become blurred.
If these symptoms persist they will gradually become worse until close reading becomes an impossibility and eventually long distance vision may be effected.
The safest and easiest options for a long sighted person are to have glasses or contact lenses. Laser surgery is also a condition, it’s worth checking in with your local optician/surgery.