Abstract
Although it is desirable that each laboratory establish its own normal values, this study examines the comparability of results obtained in two different laboratories with the Tracoustics RV-275 recorder. Twenty neurologically normal subjects, ages 8 to 32 years, with no history of strabismus or ocular muscle surgery, were studied. Horizontal saccades of 20 degrees across the midline, with fixation by the recorded and by the non-recorded eye, were observed. Peak velocity determinations distributed normally and ranged from 281 to 541 (mean and SD = 393 +/- 50) degr/sec. Mean velocities recorded during non-fixation were similar to those recorded during fixation. Based on these results, a twenty degree peak horizontal saccadic velocity of less than 300 degr/sec using this equipment is highly likely to be abnormally slow, irrespective of antagonist or symmetric movement comparisons; the latter cannot be relied on in cases of bilateral or multiple rotation abnormalities. The recording sequence may influence antagonist and symmetric pair comparisons.
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