Horizontal nystagmus Horizontal jerk nystagmus Nystagmus consisting of horizontal to-and-fro eye movements, in which the movement in one direction is faster than in the other. HP:0007286 Pendular nystagmus refers to the situation in which the eye appeared to oscillate with equal speed in either direction, in contrast to jerk nystagmus, in which the movement in one direction is faster than in the other. UMLS:C4024910