Microsaccades and Ocular Drifts<unk> or visual<unk> is the maintaining of the gaze on a single location. An animal can exhibit visual<unk> if it possess a fovea in the anatomy of their eye. The fovea is typically located at the center of the retina and is the point of clearest vision. The species in which<unk> l eye movement has been verified thus far include humans, primates, cats, rabbits, turtles, salamanders, and owls. Regular eye movement alternates between saccades and visual<unk> , the notable exception being in smooth pursuit, controlled by a different neural substrate that appears to have developed for hunting prey. The term<unk> " can either be used to refer to the point in time and space of focus or the act of<unk> g.<unk>  in the act of<unk> g, is the point between any two saccades, during which the eyes are relatively stationary and virtually all visual input occurs. In the absence of retinal jitter, a laboratory condition known as retinal stabilization, perceptions tend to rapidly fade away. To maintain visibility, the nervous system carries out a procedure called<unk> l eye movement, which continuously stimulates neurons in the early visual areas of the brain responding to transient stimuli. There are three categories of<unk> l eye movement: microsaccades, ocular drifts, and ocular microtremor. Although the existence of these movements has been known since the 1950s, only recently have their functions become clear.
Fixation 
Disarticulation
Jactitation 
Exeresis
Effacement 
Ligamentotaxis
Hydrodelineation
Osseointegration