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Eye movement record showing horizontal and vertical traces of the right (R) and left (L) eyes with the Ober-2 system. Patient no 9 when fixating in primary position with both eyes open. Note the variable amplitude and the asymmetrical waveforms with a SPD (slow phase decreasing velocity) waveform most visible in the right eye trace. Note also the difference in vertical stability between the right and left eye. Horizontal bar, 3 degrees; vertical bar, 500 ms.
