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Doctor：What ’ s the matter with your eyes？外眼没什么问题。但你有屈光不正。医生：我要给你滴几滴眼药水散瞳。Doctor：This instrument is called Refractometer and it mea‐sures the refractive condition of your eyes accurately ﹒ It ’ s perfectly comfortablefor you and needn ’ t answer any quest ......