Demer J L, Goldberg J, Porter F I, Jenkins H A, Schmidt K
Jules Stein Eye Institute, University of California at Los Angeles 90024-7002.
J Vestib Res. 1990;1(3):263-77.
Vestibularly and visually driven eye movements interact to compensate for head movements to maintain the necessary retinal image stability for clear vision. The wearing of highly magnifying telescopic spectacles requires that such compensatory visual-vestibular interaction operate in a quantitative regime much more demanding than that normally encountered. We employed electro-oculography to investigate the effect of wearing of 2x, 4x, and 6x binocular telescopic spectacles on visual-vestibular interactions during sinusoidal head rotation in 43 normal subjects. All telescopic spectacle powers produced a large, immediate increase in the gain (eye velocity/head velocity) of compensatory eye movements, called the visual-vestibulo-ocular reflex (VVOR). However, the amount of VVOR gain augmentation became limited as spectacle magnification and the amplitude of head velocity increased. Optokinetic responses during wearing of telescopic spectacles exhibited a similar nonlinearity with respect to stimulus amplitude and spectacle magnification. Computer simulation was used to demonstrate that the nonlinear response of the VVOR with telescopic spectacles is a result of nonlinearities in visually guided tracking movements. Immediate augmentation of VVOR gain by telescopic spectacles declined significantly with increasing age in the subject pool studied. Presentation of unmagnified visual field peripheral to the telescopic spectacles reduced the immediate VVOR gain-enhancing effect of central magnified vision. These results imply that the VVOR may not be adequate to maintain retinal image stability during head movements when strongly magnifying telescopic spectacles are worn.
前庭和视觉驱动的眼球运动相互作用，以补偿头部运动，从而维持清晰视觉所需的视网膜图像稳定性。佩戴高倍望远镜式眼镜要求这种补偿性视觉 - 前庭相互作用在比通常遇到的情况要求更高的定量状态下运行。我们采用眼电图来研究在43名正常受试者进行正弦头部旋转期间，佩戴2倍、4倍和6倍双目望远镜式眼镜对视觉 - 前庭相互作用的影响。所有望远镜式眼镜度数都会使补偿性眼球运动的增益（眼速度/头速度）立即大幅增加这种补偿性眼球运动称为视觉 - 前庭眼反射（VVOR）。然而，随着眼镜放大倍数和头部速度幅度的增加，VVOR增益增加的量变得有限。佩戴望远镜式眼镜期间的视动反应在刺激幅度和眼镜放大倍数方面表现出类似的非线性。计算机模拟用于证明，佩戴望远镜式眼镜时VVOR的非线性反应是视觉引导跟踪运动中非线性的结果。在所研究的受试者群体中，随着年龄的增长，望远镜式眼镜对VVOR增益的即时增加显著下降。在望远镜式眼镜周边呈现未放大的视野会降低中央放大视觉对VVOR增益的即时增强效果。这些结果表明，当佩戴高倍望远镜式眼镜时，VVOR可能不足以在头部运动期间维持视网膜图像稳定性。
