astigmatism

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• January 18. 2014 from wordnet.princeton.edu

  astigmatism — noun — english

  (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people

• February 26. 2016 from wordnet.princeton.edu

  astigmatism — noun — english

  (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point