Influence of orientation of exiting wire of search coil annulus on torsion after saccades
Influence of orientation of exiting wire of search coil annulus on torsion after saccades
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DOI：
10.1167/iovs.03-0615
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发表时间：
2004-01-01
影响因子：
4.4
通讯作者：
Zee, DS
中科院分区：
文献类型：
--
作者：
Bergamin, O;Ramat, S;Zee, DS
目的。研究表明，巩膜搜索线圈（原始线圈为鼻部，改良线圈为下端）的出线方向会影响与眨眼相关的扭转模式，可能是由于上眼睑接触了金属丝。本研究旨在探讨线圈的方向是否也会影响扫视后固定时的扭转模式，从而影响决定李氏平面和唐氏定律的参数。在距离124厘米处观察一组小型发光二极管时，记录了三名健康受试者双眼的三轴旋转。他们在三个（0 +/- 20度）方位角或海拔高度上主要进行垂直或水平扫视（幅度5- 40度）。使用改良线圈时，水平（平均时间偏差为2.9度）和垂直（3.3度）扫视时，列氏主要位置的水平分量相似。在原始线圈中，水平（12.3度）扫视后初级位置的水平分量比垂直（6.1度）扫视后初级位置的水平分量时间更长。水平扫视和垂直扫视后，初级位置的垂直分量与两个线圈相似。经过水平（0.71度vs. 1.31度）和垂直（0.84度vs.1.67度）扫视后，改良线圈后Listing的平面更薄。改良线圈在给定眼位处扭转的标准差（Donders定律）更小。水平或垂直扫视后的扭转措施取决于线圈线圈是从鼻腔还是从下方出，以及与原始线圈一起，扫视是水平还是垂直。盖子接触可以解释这些潜在的工件。他们必须在解释三维搜索线圈记录，利用巩膜环。
PURPOSE. Research has shown that the orientation of the exiting wire from a scleral search coil (nasal in the original coil, inferior in the modified coil) influences the pattern of torsion associated with blinks, presumably due to the upper eyelid touching the wire. The present study was conducted to investigate whether coil wire orientation also influences the pattern of torsion during fixation after saccades and consequently influences parameters that determine Listing's plane and Donders' law.METHODS. Three-axis, binocular eye rotations were recorded in three healthy human subjects looking at an array of small light-emitting diodes at a 124-cm distance. They made predominantly vertical or predominantly horizontal saccades (5- 40degrees, amplitude) at three (0 +/- 20degrees) azimuths, or elevations.RESULTS. With the modified coil, the horizontal component of listing's primary position was similar for horizontal (mean temporal deviation, 2.9degrees) and vertical (3.3degrees) saccades. With the original coil, the horizontal component of primary position was more temporal after horizontal (12.3degrees) than vertical (6.1degrees) saccades. The vertical component of primary position was similar with both coils after horizontal and vertical saccades. Listing's plane was thinner with the modified coil after horizontal (standard deviation of torsion from a plane of 0.71degrees vs. 1.31degrees) and vertical (0.84degrees vs.1.67degrees) saccades. The standard deviation of torsion at a given eye position (Donders' law) was smaller with the modified coil.CONCLUSIONS. Measures of torsion after horizontal or vertical saccades depend on whether the coil wire exits nasally or inferiorly and, with the original coil, whether the saccades are horizontal or vertical. Lid contact may account for these potential artifacts. They must be appreciated in the interpretation of three-dimensional search coil recordings, using the scleral annulus.