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1. Oxford American Dictionary

   astigmatism

   • IPA[əˈstiɡməˌtizəm]

   美式

   • n.
     a defect in the eye or in a lens caused by a deviation from spherical curvature, which results in distorted images, as light rays are prevented from meeting at a common focus.

   • noun: astigmatism

2. • 更多解釋

   astigmatism

   • IPA[əˈstɪɡmətɪz(ə)m]

   英式

   • n.
     a defect in the eye or in a lens caused by a deviation from spherical curvature, which results ...

   Oxford Dictionary