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English definition of “astigmatism”

astigmatism

noun [U]     /əˈstɪɡ.mə.tɪ.zəm/ specialized
a fault in the lens of the eye that reduces the quality of sight, especially a fault that stops the eye from focusingEyesight, glasses and lensesUsing the eyesThe eye and surrounding areaOptics, microscopy and lasers astigmatic     /ˌæs.tɪɡˈmæt.ɪk/ US  /-ˈmæt̬-/ adjective Eyesight, glasses and lensesUsing the eyesThe eye and surrounding areaOptics, microscopy and lasers
(Definition of astigmatism noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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