单词：astigmia
n (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
astigmia的用法和样例：
例句
- The past rectification operation aiming at myopia refraction patients has developed the rectification treatment aiming at hyperopia and astigmia patients.过去仅针对近视屈光患者施行的矫正手术，目前已发展出可针对远视与散光患者施行的矫正治疗。
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