astigmatism
noun [ U ] medical specialized uk/əˈstɪɡ.mə.tɪ.zəm/ us/əˈstɪɡ.mə.tɪ.zəm/
（尤指妨碍眼睛调焦的）散光，散视
a fault in the lens of the eye that reduces the quality of sight, especially a fault that stops the eye from focusing
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