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From The Collaborative International Dictionary of English v.0.48:
Nearsightedness \Near"sight`ed*ness\, n. (Med.)
An eyesight abnormality resulting from the eye's faulty
refractive ability, such that one can see only close objects
distinctly; the condition of being nearsighted. See Myopic,
Syn: myopia, shortsightedness.
[1913 Webster + WordNet 1.5]