以下为句子列表：
英文: The laser surgery for vision correction that replaced radial keratotomy (e.g., Lasik and other procedures) is not associated with visual disturbances at high altitudes.
中文: 取代前项技术，用以矫正视力的雷射手术与高海拔的视觉障碍并无直接关系。
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英文: The present study was to evaluate wheather radial keratotomy produces an alteration in contrast sensitivity by comparing this function in operated versus unoperated eyes.
中文: 这项研究的目的在以比较手术眼与未手术眼之对比敏感度差异，来评估放射状角膜切开术对其所造成的影响。
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英文: These patients underwent a standard eight-incision radial keratotomy procedure.
中文: 我们所采取的手术为标准八刀切开方式。
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