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English definition of “astigmatism”

astigmatism

noun [U] uk   /əˈstɪɡ.mə.tɪ.zəm/ specialized us  
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
adjective uk   /ˌæs.tɪɡˈmæt.ɪk/ us    /-ˈmæt̬-/
Eyesight, glasses and lensesUsing the eyesThe eye and surrounding areaOptics, microscopy and lasers
(Definition of astigmatism from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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