A trial manufacturing of a fundus perimeter by which the target automatically pursue eye movement

使用普通的视野检查，很难确定眼底哪个区域受到了刺激。我们开发了眼底周长，这使得在检查过程中确定眼底刺激点成为可能。然而，仍然存在一个问题。在阈值检查过程中，眼睛总是做固定运动，这使得刺激不可能保持在同一点。为了解决这一问题，本研究开发了一种新的眼底边缘系统。该系统由眼底红外视频摄像机（Topcon TRC-501A）、眼底图像追踪装置和目标装置（索尼LMD-LO4OXC液晶屏）三部分组成。调直调焦后，眼底红外视频图像显示在监控屏幕上。审查员将视频定格为模板图像，确定跟踪部分和考点。利用计算机中的硬件设备计算跟踪部件的实时位置。阈值测量使用跟踪眼球运动的包围法自动执行。我们已经将这个周长应用于非常小的暗点，如血管暗点瘤、肾暗点瘤等，可以很容易地精确检测出暗点。该系统还用于测量眼球运动。虽然红外视频眼底图像与原眼底周长图像相比有所改善，但仍不能令人满意。我们正在使用激光扫描检眼镜来改进它。

Using ordinary perimetry, it is very difficult to identify which area is stimulated on the fundus. We developed fundus perimeters which made it possible to identify the points where the stimulus on the fundus located during the examination. However there remained a problem. The eye always makes fixation movements, which make it impossible to maintain the stimulus at the same point during the threshold examination.To resolve this problem a new fundus perimety system has been developed in this study. The system is composed of three parts : the infrared video fundus camera (Topcon TRC-501A), the fundus image pursuing device and the target device (a liquid crystal screen, Sony LMD-LO4OXC). After aligning and focusing, the infrared video fundus image is displayed on the monitor screen. The examiner makes a template image freezing the video and decides the pursuing part and the examination points. The real time position of the pursuing part is calculated using a hardware device in the computer. The threshold measurement is automatically performed using the bracketing method pursuing the eye movements.We have applied this perimeter to examine very small scotomata, e.g. angioscotoma, Bjerrum scotoma etc. and could easily detect the scotomata precisely. This system is also used to measure eye movements.Although the infrared video fundus image became better comparing the former fundus perimeter, it is not yet satisfactory. We are improving it using a laser scanning ophthalmoscope.