Definition of “astigmatism” - English Dictionary

“astigmatism” in British English

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astigmatismnoun [ U ]

uk /əˈstɪɡ.mə.tɪ.zəm/ us /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 focusing

astigmatic
adjective uk /ˌæs.tɪɡˈmæt.ɪk/ us /ˌæs.tɪɡˈmæt̬.ɪk/

(Definition of “astigmatism” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)