 Monocular pendular nystagmus are usually seen in two situations. One would be an acquired disorder of the visual sensory pathway, anywhere from the anterior aspect of the eye through the optic nerve. Second situation would be the acquired disorder of the brainstem, most commonly multiple sclerosis. Note here the oscillations seen in the right are quite different from what we had seen in spasms and newtons. They're slower and they're of higher amplitude.