Department of Neurosurgery (PY-MW, ST, AC-HC, YC, H-TW, K-YC), Kwong Wah Hospital, Hong Kong, China; and School of Optometry (AM-YC), The Polytechnic University of Hong Kong, Hong Kong, China.
J Neuroophthalmol. 2018 Mar;38(1):65-69. doi: 10.1097/WNO.0000000000000575.
Seesaw nystagmus is characterized by cyclic eye movements with a conjugate torsional component and a dissociated vertical component. In the first half of the cycle, one eye elevates and intorts, whereas the other eye depresses and extorts. The pattern is reversed in the remaining half of the cycle. We describe a patient with a giant pituitary adenoma who developed pendular seesaw nystagmus. Disturbance in the visuovestibular system is postulated to contribute to this form of seesaw nystagmus. Lesions compressing the optic chiasm and the accessory optic system could interrupt the transmission of retinal error signals to the inferior olivary nucleus and the interstitial nucleus of Cajal, thus interfering with the adaptive mechanism of the vestibulo-ocular reflex and leading to pendular seesaw nystagmus.
跷跷板眼震的特征是眼球运动呈周期性，伴有共轭扭转成分和分离垂直成分。在周期的前半段，一只眼抬高并内转，而另一只眼则降低并外转。在周期的后半段，模式相反。我们描述了一位患有巨大垂体腺瘤的患者，他出现了摆动型跷跷板眼震。视前庭系统的紊乱被认为是导致这种形式的跷跷板眼震的原因之一。压迫视交叉和副视系统的病变可能会中断视网膜误差信号向下橄榄核和 Cajal 间质核的传递，从而干扰前庭眼反射的适应机制，导致摆动型跷跷板眼震。
