noun (n)

• (ophthalmology) eyesight abnormality resulting from the eye's faulty refractive ability; distant objects appear blurred(noun.state)

  Synonym:
  nearsightedness, shortsightedness
  Antonym:
  farsightedness, hypermetropia, hypermetropy, hyperopia, longsightedness
  

  source: wordnet30
• Nearsightedness; shortsightedness; a condition of the eye in which the rays from distant object are brought to a focus before they reach the retina, and hence form an indistinct image; while the rays from very near objects are normally converged so as to produce a distinct image. It is corrected by the use of a concave lens.(noun)

  source: webster1913