 One reason for the saccadic movement of the human eye is that the central part of the retina—known as the fovea—which provides the high-resolution portion of vision is very small in humans, only about 1–2 degrees of vision, but it plays a critical role in resolving objects.By moving the eye so that small parts of a scene can be sensed with greater resolution, body resources can be used more efficiently.Saccades are one of the fastest movements produced by the human body (blinks may reach even higher peak velocities).