Hine T
Department of Psychology, Massachusetts Institute of Technology, Cambridge.
J Vestib Res. 1990;1(4):357-71.
The kinematics of the horizontal VOR for near fixation demand that VOR gain should change dependent on the target distance and the orientation of the head with respect to the target, or, equivalently, the amount of ocular vergence and the asymmetry of this vergence. Across two experiments, the gain of the VOR was measured in the right eye of humans who rotated their heads to the right or left while viewing a target placed either 22, 32.5 or 200 cm from the center of head rotation, in conditions with and without visual feedback. When the eye was in-line with the target, the measured VOR gain was up to 43% greater than when the eye was in an eccentric position. However, in the eccentric position, higher VOR gains were achieved with visual feedback of the target than without feedback, indicative of a visual component in the compensatory eye movement. Also, by changing the posture of the left eye but keeping the right eye constant, the VOR gain in the right eye was changed substantially during a subsequent head rotation. Hence, the positions of both eyes in their orbits determine the gain of the VOR in each eye.
近注视时水平前庭眼反射（VOR）的运动学要求VOR增益应根据目标距离以及头部相对于目标的方向而变化，或者等效地，根据眼的聚散量以及这种聚散的不对称性而变化。在两项实验中，测量了人类右眼的VOR增益，这些人在观看距离头部旋转中心22、32.5或200厘米处的目标时，将头部向右或向左旋转，实验条件包括有视觉反馈和无视觉反馈。当眼睛与目标对齐时，测量到的VOR增益比眼睛处于偏心位置时高出43%。然而，在偏心位置，有目标视觉反馈时比无反馈时能获得更高的VOR增益，这表明补偿性眼球运动中存在视觉成分。此外，通过改变左眼的姿势但保持右眼不变，在随后的头部旋转过程中，右眼的VOR增益会发生显著变化。因此，双眼在眼眶中的位置决定了每只眼睛的VOR增益。
