Abnormality of ocular smooth pursuit Saccadic smooth pursuit interruptions HP:0000530 An abnormality of tracking eye movements in which smooth pursuit is interrupted by an abnormally high number of saccadic movements. Saccadic slow pursuit Tracking eye movements consist of two different components, namely, smooth pursuit and saccades. Smooth pursuit, or just pursuit, is a class of rather slow eye movements that minimizes retinal target motion. Saccades are rapid eye movements that align the fovea with the target. The function of smooth pursuit is to keep a slowly moving target stable on the fovea of each eye. If smooth pursuit cannot keep up with a visual target (i.e., low pursuit gain, which is defined as the ratio of eye movement velocity to target velocity), saccades will be used to help catch up to the visual target, hence the choppy or saccadic appearance when pursuit is impaired. UMLS:C1836479 HP:0001152 Saccadic pursuit movements Saccadic smooth pursuit