Figure 1.

Video-oculographic recordings from patients with “congenital SOP,” showing vertical fusional vergence associated with (A) cycloversion toward the side of the higher, right eye (which was the pattern found in 7 of the 11 patients; patient 5 shown), and (B) cycloversion away from the side of the higher, right eye (the pattern found in one patient: patient 8), and (C) cyclovergence, with the higher, left eye torting away from, and the lower, right eye torting toward, the side of the higher, left eye (the pattern found in 3 of the 11 patients; patient 9 shown). Vertical vergence (thick black trace) is shown, with positive representing the right eye higher than the left. Upward deflections of right eye torsion (thin black trace) and left eye torsion (thin gray trace) represent clockwise eye movements from the subject's perspective looking forward (extorsion of the right eye and intorsion of the left eye). LEV, left eye vertical; REV, right eye vertical; LET, left eye torsion; RET, right eye torsion. Gaps in the recordings indicate blink artifacts that have been removed for clarity. The vergence tracings have been zeroed at the resting, fusing position with both eyes open for clarity.