Farsightedness is a fairly common vision problem, in which people can see objects that are far away more clearly than they can see objects that are near.
Farsightedness is part of a class of vision distortions called refractive errors. It means the light passing through the lens of your eye isn't being focused properly on the retina at the back. That means the images the brain is receiving from the retina are distorted. In farsightedness, this distortion occurs because the eyeball is shortened, whereas in nearsightedness it's elongated.