Hirvonen T P, Aalto H, Pyykkö I, Juhola M
Department of Otorhinolaryngology, University Central Hospital of Helsinki, Finland.
Otolaryngol Head Neck Surg. 2000 Dec;123(6):766-9. doi: 10.1067/mhn.2000.111357.
The vestibulo-ocular reflex stabilizes gaze during head movements by producing compensatory eye movements. Retinal image velocity (RIV) is defined as the difference between the eye and head velocities. The RIV of 20 vestibular schwannoma (VS) patients and 17 healthy controls was measured with a head autorotation test. The head autorotation test had a sensitivity of 80% and a specificity of 88%. The mean RIV (degree/second) +/- 95% confidence intervals of the VS patients in the 5 frequency bands of 1 to 5 Hz was respectively 4.8 (4.2 to 5.5), 11.5 (8.6 to 14.4), 21.7 (15.5 to 27.9), 25.2 (17.1 to 33.4), and 26.1 (13.1 to 39.1). The RIV of the VS patients was asymmetrically larger on the operated side (P<0.05) in the frequency band of 1 Hz. The mean RIV was significantly (P<0.05) larger in the VS patients than in the controls in the frequency bands of 1 to 4 Hz. The vestibulo-ocular reflex is inaccurate after VS surgery; but the inaccuracy may not lead to the occurrence of any symptoms.
前庭眼反射通过产生代偿性眼球运动在头部运动期间稳定注视。视网膜图像速度（RIV）被定义为眼球速度与头部速度之间的差值。使用头部自动旋转试验测量了20例前庭神经鞘瘤（VS）患者和17名健康对照者的RIV。头部自动旋转试验的敏感性为80%，特异性为88%。VS患者在1至5Hz的5个频段中的平均RIV（度/秒）±95%置信区间分别为4.8（4.2至5.5）、11.5（8.6至14.4）、21.7（15.5至27.9）、25.2（17.1至33.4）和26.1（13.1至39.1）。在1Hz频段，VS患者手术侧的RIV不对称性更大（P<0.05）。在1至4Hz频段，VS患者的平均RIV显著高于对照组（P<0.05）。VS手术后前庭眼反射不准确；但这种不准确可能不会导致任何症状的出现。
