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Definition of astigmatism


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Houghton Mifflin

a·stig·ma·tism  audio  (-stgm-tzm) KEY 

NOUN:
A visual defect in which the unequal curvature of one or more refractive surfaces of the eye, usually the cornea, prevents light rays from focusing clearly at one point on the retina, resulting in blurred vision.

ETYMOLOGY:
a-1 + Greek stigma, stigmat-, point (from stizein, stig-, to tattoo; see steig- in Indo-European roots)

OTHER FORMS:
astig·matic  (stg-mtk) KEY (Adjective)(Noun), astig·mati·cal·ly(Adverb)


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