HUMAN GAZE STABILITY IN THE HORIZONTAL VERTICAL AND TORSIONAL DIRECTION DURING VOLUNTARY HEAD MOVEMENTS, EVALUATED WITH A THREE-DIMENSIONAL SCLERAL INDUCTION COIL TECHNIQUE
HUMAN GAZE STABILITY IN THE HORIZONTAL VERTICAL AND TORSIONAL DIRECTION DURING VOLUNTARY HEAD MOVEMENTS, EVALUATED WITH A THREE-DIMENSIONAL SCLERAL INDUCTION COIL TECHNIQUE
复制标题
DOI：
10.1016/0042-6989(87)90078-2
复制
发表时间：
1987-01-01
期刊：
影响因子：
1.8
通讯作者：
VANDENBERG, AV
中科院分区：
文献类型：
--
作者：
FERMAN, L;COLLEWIJN, H;VANDENBERG, AV
采用一种新型巩膜搜索线圈对8名准视者进行了水平、垂直和扭转三维凝视稳定性的测量。受试者在光学无限远处注视点目标时，头部保持静止或在水平、垂直或扭转平面上振荡0.16-0.67 Hz（振幅约10度）。垂直凝视和头部坐标的计算完全校正了非线性几何关系和由于眼睛上线圈的错位而产生的交叉耦合伪影。在水平和垂直方向上的凝视不稳定性几乎是相同的。当头部静止时，在这两个方向上，注视位置（包括扫视）的平均标准差约为7分弧度；平均非跳眼视网膜成像速度为20-30分弧/秒。在头部振荡期间，这些值增加到约16分弧度和1度/秒；平均约2.5%的头部运动未被补偿性眼球运动纠正。这些发现与我们之前在水平面上的结果一致；修正的影响相对较小，因为水平和垂直的非定常性交叉耦合对扭转头运动的影响通常小于10%。然而，当故意造成头部扭转时，矫正是很重要的。扭转平面的凝视稳定性明显低于水平和垂直平面。头部不动时，凝视位置的平均SD约为17 min弧；平均扭转非跳眼视网膜成像速度约为46分弧/秒。扭转补偿眼动的增益与频率有关，从静态条件下的0.26上升到0.16 Hz时的0.42和0.67 Hz时的0.64。因此，视网膜图像在扭转方向上的位置不稳定性和速度比在水平和垂直方向上大一个数量级。
The stability of gaze in three dimensions (horizontal, vertical and torsion) was measured with a new type of scleral search coil in eight emmetropic observers. Subjects held the head still or oscillated it a 0.16-0.67 Hz (amplitude about 10 deg) in the horizontal, vertical or torsional plane while fixating a point target at optical infinity. Veridical gaze and head coordinates were calculated with full correction for non-linear goniometric relations and for cross-coupling artifacts due to misalignments of the coil on the eye. The amount of gaze instability in the horizontal and vertical direction was virtually identical. With the head still, in either of these directions the mean standard deviation of gaze position (inclusive saccades) was about 7 min arc; mean non-saccadic retinal image speeds were 20-30 min arc/sec. During head oscillation these values increased to about 16 min arc and 1 deg/sec; a mean of about 2.5% of the head motion remained uncorrected by the compensatory eye movements. These findings agree well with our earlier results for the horizontal plane; the effect of the corrections was relatively small because the adventitious cross-coupling of horizontal and vertical to torsional head movements proved to be usually smaller than 10%. However, the corrections were important when head torsion was deliberately produced. Gaze stability in the torsional plane was considerably inferior to that in the horizontal and vertical plane. With the head held still, the mean SD of torisonal gaze position was about 17 min arc; mean torsional non-saccadic retinal image speed was about 46 min arc/sec. Gain of the torsional compensatory eye movements was frequency dependent and rose from about 0.26 in static conditions (0 Hz) to about 0.42 at 0.16 Hz and 0.64 at 0.67 Hz. Accordingly, position instability and speed of the retinal image in torsion were about an order of magnitude larger than in the horizontal and vertical direction.