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astigmatism
noun
(optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
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əˈstɪɡmətɪzm̩
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noun
(optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
noun
(ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people
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