Abstract
Thirty four patients who complained only of tinnitus and thirtry six with orthostatic hypotension were tested with the equilibrium examination.The numbers of nystagmus and of maximal slow phase velocity in OKN were comparison in different age groups.The number of nystagmus beats and the maximal slow phase velocity in OKN were similar in the yourger and older groups. However, with higher optokinetic stimuli (70, 80, 90 deg/sec) the slow phase velocity deteriorated, especially in the older groups.The reduction was significantly greater in those over 65 than in 35-54 year old group.Our clinical observations suggest that OKN disturbance in the elderly patients is due mainly to a dysfunction of the coordination mechanism which controls the optokinetic mechanism and smooth pursuit.
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