Square-wave oscillations are runs of back-to-back square-wave jerks, associated with oscillopsia. On clinical examination, these eye movements often occur in bursts precipitated by gaze and may resemble ocular flutter1.
Figure 1. Square-wave oscillations. Horizontal saccade tracings demonstrate continuous runs of back-to-back square-wave jerks.
From: Rucker JC. Nystagmus and Saccadic Intrusions. Continuum (Minneap Minn). 2019;25(5):1376-1400.
Video 1. Square-wave oscillations.
(vv)Sqwaveosc.mp4(tt)
From: Rucker JC. Nystagmus and Saccadic Intrusions. Continuum (Minneap Minn). 2019;25(5):1376-1400.