Sheahan N F, Coakley D, Hegarty F, Bolger C, Malone J
Mercer's Institute for Research on Ageing, St. James's Hospital, Dublin, Ireland.
Med Biol Eng Comput. 1993 May;31(3):205-12. doi: 10.1007/BF02458038.
The frequency of ocular microtremor (OMT) is related to the functional status of the brain stem, and thus OMT may be useful in the diagnosis and management of brain stem disorders. The paper discusses the design of an OMT measurement system and reports quantitative specifications for three portable systems. All systems use a piezo-electric element as the transducer, which measures the displacement of the sclera during eye rotations. The systems differ in the manner in which the signal is recorded. All systems can detect eye movements corresponding to displacements of the sclera ranging from 12 to over 3000 nm. The frequency responses of all systems are flat (< 2 dB deviation from peak response) between 20 and 150 Hz. The phase response shows deviations (< pi) at the extremes of this range, but qualitative comparison of input and measured signals demonstrates that phase distortion is not excessive. Thus all systems are acceptable for clinical studies involving OMT.
眼球微震颤（OMT）的频率与脑干的功能状态相关，因此OMT可能有助于脑干疾病的诊断和管理。本文讨论了一种OMT测量系统的设计，并报告了三种便携式系统的定量规格。所有系统都使用压电元件作为传感器，该传感器测量眼球转动期间巩膜的位移。这些系统在信号记录方式上有所不同。所有系统都能检测到与巩膜位移范围从12到超过3000纳米相对应的眼球运动。所有系统的频率响应在20至150赫兹之间是平坦的（与峰值响应的偏差<2分贝）。相位响应在该范围的极值处显示出偏差（<π），但输入信号和测量信号的定性比较表明相位失真并不过大。因此，所有系统都适用于涉及OMT的临床研究。
