Abnormality of eye movement Oculomotor apraxia Oculomotor apraxia leads defective or absent horizontal voluntary eye movements with head thrusting to look at objects to the side as well as jerky, abnormal eye movements. Defective or absent horizontal voluntary eye movements Ocular motor apraxia HP:0007764 UMLS:C3489733 HP:0000628 Ocular motor apraxia is a deficiency in voluntary, horizontal, lateral, fast eye movements (saccades) with retention of slow pursuit movements. The inability to follow objects visually is often compensated by head movements. There may be decreased smooth pursuit, and cancelation of the vestibulo-ocular reflex. HP:0000657 UMLS:C4020886 SNOMEDCT_US:193662007 Apraxia