Unlike the jerky, saccadic movement of the eye as it jumps around a scene, smooth pursuit is the active tracking of a moving object in your environment.
Cheetah running. Photo by Dr. Zoltan on GoodFreePhotos
The purpose of smooth pursuit eye movements is to enable us to focus our eyes on moving objects by utilizing mechanisms of visual motion processing. It helps us maintain a clear and stable visual perception of the moving object.
Wikipedia on Smooth Pursuit
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