Seesaw nystagmus is a very rare disturbance of ocular motility. The site of the responsible lesion has not been clearly identified, but a central lesion has been postulated in most previous reports. This case, the eighth noted in the literature,1-5 is recorded as it offers a more probable explanation for this form of nystagmus.
The original case report by Maddox1 contains a superlative description of seesaw nystagmus. The eye movements in the patient described herein are identical to those described by Maddox and consists essentially of a disjunctive vertical pendular movement: One eye rises as the other falls. Simultaneous with the opposed rising and falling of the eyes, there occurs a conjugate parallel torsion. The rising of the right eye and the falling of the left eye are associated with a fine torsional movement to the left; the rising of the left eye and the falling of the