通常情况下，医生在对病人进行激光眼科校正手术时使用视频摄像机来跟踪眼球的转动，以便使激光手术刀落在正确的地方。

Normally when patients undergo corrective laser eye surgery, surgeons use video cameras to track the position of the eye so that the surgical laser targets the right place on the cornea.