Horizontal nystagmus Congenital nystagmus Horizontal pendular nystagmus UMLS:C1866180 Nystagmus consisting of horizontal to-and-fro eye movements of equal velocity. HP:0200069 HP:0007811 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. Pendular nystagmus