Pfirsching H P, Frisch N, Wiegand W
Medizinisches Zentrum für Augenheilkunde, Universität Marburg.
Ophthalmologe. 1994 Feb;91(1):91-4.
A computer-controlled system for the automatic induction, registration, and analysis of optokinetic nystagmus is presented. On a high-resolution computer video monitor, a horizontally moving pattern of vertical stripes of equal size and distance is displayed. Stimulus size, velocity, and direction of movement are computer-controlled and variable. Exposure to this display induces horizontal optokinetic nystagmus in the patient. The patient's eye movements are registered by an infrared non-contact limbus-tracker system and transferred to the computer in a digitized format. With a specifically developed computer program the pursuit eye movements are detected and analyzed for amplitude, duration, and velocity and may be displayed on a second monitor. Simultaneously, the congruence of the direction of the stimulus and of the direction of the eye movement are automatically supervised and quantified by an "acceptance coefficient." The first clinical studies with healthy experimentees showed that for each stimulus size a certain stimulus velocity exists that provides maximal nystagmus provocation. Smaller stimulus sizes require slower stimulus velocities. Future developments of the system will allow applications in other fields of nystagmus research and in the accessment of objective visual acuity.
介绍了一种用于自动诱导、记录和分析视动性眼震的计算机控制系统。在高分辨率计算机视频监视器上，显示由等大小和等间距的垂直条纹组成的水平移动图案。刺激的大小、速度和运动方向由计算机控制且可变。患者暴露于该显示会诱发水平视动性眼震。患者的眼球运动由红外非接触式角膜缘跟踪系统记录，并以数字化格式传输到计算机。通过专门开发的计算机程序，检测并分析追随性眼球运动的幅度、持续时间和速度，并可显示在第二个监视器上。同时，刺激方向与眼球运动方向的一致性由“接受系数”自动监测和量化。对健康受试者进行的首次临床研究表明，对于每种刺激大小，都存在一定的刺激速度，可提供最大的眼震激发效果。较小的刺激大小需要较慢的刺激速度。该系统的未来发展将允许其应用于眼震研究的其他领域以及客观视力评估。
