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n. - (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point; (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea.

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Usage examples (35)
  • I have astigmatism - can I wear soft lenses?
  • astigmatism: An astigmatism occurs when the cornea or lens (or both) are not perfectly symmetrical.
  • There is an optical condition of the eye known as astigmatism, in which the cornea is usually at fault.
  • That produces a condition called astigmatism, the effect of which is to make images appear blurry whether near or far.
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