(ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people
(optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
例句
用作名词 (n.)
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。
美
[æs'tɪgmɪə]
