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。
Our eyes are constantly in motion. Even during visual fixation, small eye movements continually jitter the location of gaze.
我们的眼睛处于不断运动中。即使在凝视时，在所凝视的位置眼球仍不断进行细小的震动。
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