When the eyes stop to focus it is called a fixation and the movements between these fixations are called saccades . See image below
当眼睛停留集中在某点是我们称它为固视，当在若干固视点间移动时我们把它称做扫视。
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Use of image intensification can be used to check coronal plane alignment of the temporary fixation k-wire or first periarticular screw before final fixation of the articular portion is conducted.
Closed intramedullary nailing or percutaneous fracture fixation techniques may need to be abandoned for an open technique if the image intensifier fails.