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单词 astigmatism
释义 astigmatism
 /euh stig"meuh tiz'euhm/,  n.  
  1. Also called astigmia /euh stig"mee euh/. Ophthalm. a refractive error of the eye in which parallel rays of light from an external source do not converge on a single focal point on the retina.
  2.  Optics.   an aberration of a lens or other optical system in which the image of a point is spread out along the axis of the system.
 [1840-50; ASTIGMAT(IC) + -ISM]
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