• Webster's Revised Unabridged Dictionary
    • Long-sightedness (Med) See Hypermetropia.
    • Long-sightedness The state or condition of being long-sighted; hence, sagacity; shrewdness.
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Century Dictionary and Cyclopedia
    • n long-sightedness The faculty of seeing objects at a great distance; hence, sagacity as regards the future; far-sighted discernment.
    • n long-sightedness In pathology, a defect of sight owing to which objects near at hand are seen indistinctly, while those at remoter distances appear distinctly; hypermetropia or presbyopia.
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In literature:

The girl does not see it, but the priest sees it with the long-sightedness of decrepitude.
"The Saint" by Antonio Fogazzaro
And I only wish you'd all had the gift of clear-sightedness to see through him long ago, and cut yourselves off from him as I did.
"A Charming Fellow, Volume II (of 3)" by Frances Eleanor Trollope