astigmatism

  1. Noun.  (optics) A defect of a lens such that light rays coming from a point do not meet at a focal point so that the image is blurred.
  2. Noun.  (pathology) A disorder of the vision, usually due to a misshapen cornea, such that light does not focus correctly on the retina causing a blurred image.

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This entry was last updated on RefTopia from its source on 3/20/2012.