Quantitative assessment of divergence eye movements
Quantitative assessment of divergence eye movements
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DOI：
10.1167/8.12.5
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发表时间：
2008-01-01
影响因子：
1.8
通讯作者：
Alvarez, Tara L.
中科院分区：
文献类型：
--
作者：
Lee, You Yun;Chen, Tainsong;Alvarez, Tara L.
目的：本研究试图量化发散性眼球运动以及发散和收敛之间的差异，以平滑移动的斜坡、台阶和消失的台阶刺激。方法：八名视力正常的成年受试者参加了三项实验，使用红外角膜缘眼动仪研究反应动态。结果：有四个主要发现：（1）慢速斜坡观察到平滑跟踪行为，而快速斜坡则引发平滑跟踪与高速、阶梯状行为相结合； (2) 在较快斜坡中观察到的高速分量与发散步具有相似的主序列； (3)从受试者接近解离性隐斜视水平开始的消失步骤的发散动力学与相应的步骤反应相似； (4)发散斜坡的高速分量取决于初始聚散位置，而收敛斜坡的高速分量则不然。结论：结果表明，类似于收敛的发散中存在预编程成分；然而，与收敛不同，发散斜坡响应的高速分量取决于初始收敛位置。
Purpose: This study sought to quantify divergence eye movements and differences between divergence and convergence to smoothly moving ramp, step, and disappearing step stimuli. Methods: Eight visually normal, adult subjects participated in three experiments investigating the dynamics of responses using an infrared limbal eye tracker. Results: There were four primary findings: (1) a smooth tracking behavior was observed for slow ramps while the fast ramps elicited smooth tracking combined with a high-velocity, step-like behavior; ( 2) the high-velocity components observed in the faster ramps had a similar main sequence as divergence steps; ( 3) divergence dynamics to disappearing steps starting at the subject's near dissociated phoria level were similar to corresponding step responses; and ( 4) the high-velocity components from divergence ramps were dependent on initial vergence position, whereas the high-velocity components from convergence ramps were not. Conclusion: The results suggest a preprogrammed component is present in divergence similar to convergence; however, unlike convergence, the high-velocity components from divergence ramp responses are dependent on initial vergence position.