INSTABILITY OF OCULAR TORSION DURING FIXATION - CYCLOVERGENCE IS MORE STABLE THAN CYCLOVERSION
INSTABILITY OF OCULAR TORSION DURING FIXATION - CYCLOVERGENCE IS MORE STABLE THAN CYCLOVERSION
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DOI：
10.1016/0042-6989(94)90011-6
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发表时间：
1994-04-01
期刊：
影响因子：
1.8
通讯作者：
COLLEWIJN, H
中科院分区：
文献类型：
--
作者：
VANRIJN, LJ;VANDERSTEEN, J;COLLEWIJN, H
我们研究了双眼扭转的自发变化。变化表示为在长达 32 秒的时间内测量的扭转眼睛位置的 SD。受试者观看单个点目标 32 秒。在一半的试验中，大的随机点背景图案叠加在点上。用巩膜感应线圈测量双眼的运动。自发扭转运动很大程度上是共轭的：旋转比旋转稳定得多。这种差异不是由于辊头移动造成的。背景图案提高了环交的稳定性。尽管旋转旋转的整体稳定性（位置的 SD）不受背景影响，但背景在四分之三的受试者中诱发或增强了小幅度扭转性眼球震颤。我们假设，与绝对扭转位置相比，旋转旋转与旋转旋转稳定性的差异反映了扭转视网膜对应的更大重要性。在两个受试者中，我们发现了环视症存在的证据，表现为由背景的出现和消失引起的环视的系统性变化。
We investigated spontaneous variation of binocular torsion. Variation was expressed as SD of torsional eye positions measured over periods up to 32 sec. Subjects viewed a single dot target for periods of 32 sec. In half of the trials a large random-dot background pattern was superimposed on the dot. The movements of both eyes were measured with scleral induction coils. Spontaneous torsional movements were largely conjugate: cyclovergence was much more stable than cycloversion. This difference was not due to roll head movements. Stability of cyclovergence was improved by the background pattern. Although overall stability (SD of position) of cycloversion was unaffected by a background, the background induced or enhanced a small-amplitude torsional nystagmus in 3 out of 4 subjects. We hypothesize that the difference in stability of cycloversion vs cyclovergence reflects the greater importance of torsional retinal correspondence, compared to absolute torsional position. In two subjects we found evidence for the existence of cyclophoria, manifested by systematic shifts in cyclovergence caused by the appearance and disappearance of the background.