Change in pendular nystagmus from oculopalatal tremor over a four-year period

This is a patient who developed oculopalatal tremor months following a pontine hemorrhage. Although it is not shown here, she also has palatal tremor. In the first video which was taken 1 year after her hemorrhage, a vertical-torsional pendular nystagmus can be seen, that is mildly dissociated given slightly more intense nystagmus in the left eye as compared to the right. She also experienced more oscillopsia in the left eye compared to the right eye. Five years after her hemorrhage, the nystagmus is almost exclusively torsional pendular. These videos make the point that nystagmus due to OPT can change over years, and cases have even been reported of patients with OPT whose pendular nystagmus resolves completely over a number of years