Vestibulo-ocular and optokinetic deficits in albinos with congenital nystagmus

J. L. Demer, David Samuel Zee

Research output: Contribution to journalArticle

Abstract

Vestibular and optokinetic responses were recorded in three albino subjects with congenital nystagmus. Although an ice-water caloric stimulus did not elicit nystagmus, all patients showed a response to rotational stimuli containing high frequency components. Vestibular responses to a constant velocity rotation decremented with abnormally short time constants of 1-2 sec (normal 15-20 sec). For sinusoidal oscillation, in one subject, the cut-off frequency (where the amplitude of the response was 70% of maximum) was increased to 0.8 Hz (normal about 0.01 Hz). Full-field optokinetic stimulation generated no nystagmus response. These abnormalities may be due to defects in networks that act as mathematical integrators: either the final common neural gaze-holding network that converts velocity into position information for the ocular motor neurons or the 'velocity-storage' mechanism that normally combines sensory inputs from both the labyrinths and visual system to generate appropriate (per-rotatory) nystagmus during rotation and to suppress inappropriate (post-rotatory) nystagmus after rotation.

Original languageEnglish (US)
Pages (from-to)739-745
Number of pages7
JournalInvestigative Ophthalmology and Visual Science
Volume25
Issue number6
StatePublished - 1984

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Congenital Nystagmus
Physiologic Nystagmus
Ice
Motor Neurons
Inner Ear
Water

ASJC Scopus subject areas

  • Ophthalmology

Cite this

Vestibulo-ocular and optokinetic deficits in albinos with congenital nystagmus. / Demer, J. L.; Zee, David Samuel.

In: Investigative Ophthalmology and Visual Science, Vol. 25, No. 6, 1984, p. 739-745.

Research output: Contribution to journalArticle

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