Mehdorn E, Kommerell G, Meienberg O
Albrecht Von Graefes Arch Klin Exp Ophthalmol. 1979 Jan 15;209(3):209-17. doi: 10.1007/BF00414613.
The essential disturbance in five patients with vertical nystagmus was an inability to generate smooth pursuit eye movements in the direction of the quick phase of their nystagmus. As the cause of this behavior, the authors suggest an asymmetric impairment of the visual input to the pursuit system. This defect causes a 'directional preponderance' of the pursuit system detectable as a continuous drift off target. The drift is interrupted by refoveating saccades, thus resulting in a vertical nystagmus.
五名患有垂直性眼球震颤患者的基本障碍是无法在其眼球震颤快相方向上产生平稳跟踪眼球运动。作为这种行为的原因，作者认为是跟踪系统视觉输入的不对称损伤。这种缺陷导致跟踪系统出现“方向优势”，可检测为持续偏离目标的漂移。这种漂移被重新注视的扫视打断，从而导致垂直性眼球震颤。
