LASIK eye surgery changes the shape of your cornea—the transparent membrane that arcs over your pupil and the colored part of your eye (iris).
LASIK 眼科手术改变了你的角膜的形状——角膜是覆盖在你的瞳孔和你的眼睛的有色部分（虹膜）上的弧形透明膜。
The pupil of the eye dilates and contracts in response to light.
作为对光线作出的反应，眼睛的瞳孔会放大或缩小。
The coddington is essentially a sphere with a slot cut in it to allow an aperture smaller than the pupil of the eye.
科丁顿放大镜实质上是一个球，球面上开槽，使得孔径小于眼的瞳孔。
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