PMC9149443_01
Eye trace under binocular viewing conditions showing stable fixation. The upper trace shows horizontal eye movements; vertical eye movements are in the lower trace.
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PMC9149443_01_cop-0013-0286-g01.jpg
F1
Figure 1 shows the eye movement recording obtained during binocular fixation in the primary position.
Eye movement trace showing voluntary flutter in a 2-s time window. The upper trace shows horizontal eye movements; vertical eye movements are in the lower trace.
cop-0013-0286-g02.jpg
PMC9149443_01_cop-0013-0286-g02.jpg
F2
Figure 2, recorded from the left eye, shows voluntary flutter performed by the patient over a 2-s period. The upper eye movement trace in Figure 2 shows back-to-back horizontal saccadic oscillations with an average frequency of 13 Hz, reducing over time.