The Collaborative International Dictionary of English v.0.48:

Farsightedness \Far"sight`ed*ness\, n.
   1. Quality of bbeing farsighted.
      [1913 Webster]

   2. (Med.) Hypermetropia.
      [1913 Webster]

WordNet (r) 3.0 (2006):

farsightedness
    n 1: a reduced ability to focus on near objects caused by loss
         of elasticity of the crystalline lens after age 45 [syn:
         presbyopia, farsightedness]
    2: abnormal condition in which vision for distant objects is
       better than for near objects [syn: hyperopia,
       hypermetropia, hypermetropy, farsightedness,
       longsightedness] [ant: myopia, nearsightedness,
       shortsightedness]
    3: seeing ahead; knowing in advance; foreseeing [syn:
       prevision, foresight, farsightedness, prospicience]