“…[ 2 ] Abducting nystagmus and retained convergence are not sine qua non for INO though are characteristically present, the former may be subtle, missed clinically and may need laboratory evaluation. [ 3 ] The medial longitudinal fasciculus (MLF) carries otolithic pathways along with fibers controlling horizontal and vertical gazes. Abduction nystagmus with hypermetric abduction is due to increased phasic innervations adjusted to adduction paresis.…”