Head oscillations in infantile nystagmus syndrome

Journal of AAPOS : the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
Fatema F Ghasia, Aasef G Shaikh

Abstract

To quantitatively characterize eye and head oscillations in patients with infantile nystagmus syndrome (INS). Vertical and horizontal eye and head position in INS patients were measured simultaneously at a sampling frequency of 500 Hz. Eye and head movements were measured continuously for 180 seconds. The data was calibrated and converted to angular vectors, which were further analyzed with custom software. A total of 10 patients with INS were included: 3 with pseudo-jerk, 3 with pure-jerk, 2 with pseudo-pendular with foveating saccade form of jerk, 1 with bidirectional jerk, and 1 with asymmetric pendular nystagmus waveforms. None of the patients had periodic, aperiodic, or a superimposed latent nystagmus component. Two types of head oscillations were observed: one with a frequency of 1-3 Hz, present in all patients; and another with a frequency range of 5-8 Hz, present in only 7 patients. High-frequency oscillations were episodic, whereas low-frequency oscillations were constantly present. Peak velocity of the high-frequency head oscillations and eye velocity of nystagmus were not correlated, suggesting that these oscillations did not influence foveation. Two types of head oscillations were found in INS patients: a constant, ...Continue Reading

References

Aug 1, 1979·Journal of Neurology, Neurosurgery, and Psychiatry·M A Gresty, G M Halmagyi
Sep 1, 1976·The British Journal of Ophthalmology·M GrestyH Eggars
Nov 21, 1975·Documenta Ophthalmologica. Advances in Ophthalmology·L F Dell'Osso, R B Daroff
Jun 15, 2011·Journal of the Neurological Sciences·Evangelos AnagnostouDimitri Anastasopoulos

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Citations

Sep 22, 2018·International Ophthalmology Clinics·Alaa S Bou Ghannam, Salma Yassine
Dec 8, 2015·Current Opinion in Neurology·Aasef G Shaikh
Apr 19, 2020·Journal of Neuro-ophthalmology : the Official Journal of the North American Neuro-Ophthalmology Society·Palak Gupta, Aasef G Shaikh

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