We have developed a method of measuring the three components of eye movement noninvasively by using an image analyzing system. The horizontal and vertical is measured to track the pupil and the torsional is measured to track a particular iris striation automatically. The system consists of a high resolution infrared CCD camera system with a pair of goggles and an eye movement analysis system using computerized image processing. A new pulse eye illumination method of the high resolution camera system makes it possible to take clear images of the pupil and iris striations, so the images can be analyzed automatically and continuously. We report the performance of our method as estimated with a simulation system, the technique of our system in detail and the clinical data of three components of the positioning nystagmus, etc. This system could be used for clinical examination of vertigo.
