Study on Man-Machine Interface System for the Real-Time Measurement of Eyestrain

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The purpose of this research is to investigate the development of a man-machine interface system for the real-time measurement of eyestrain by using an automatic eye-tracking technique.We have tried to develop a man-machine interface system that connects the eye-tracking system with the optical interferometer. The eye-tracking system will catch the eye movements of the subject while he is using a computer, and we can observe the eyestrain of the subject as the interference fringe in real time by the optical interferometer. The difference of the interference fringe between the normal eye and the dry eye enables us to measure the degree of the eyestrain of the subject under investigation.Though we have not achieved to install the optical interferometer in the eye-tracking system because of the space limitation, we have observed the interference fringe of the subject and thus have verified the effectiveness of the optical interferometer as the measurement tool of the eyestrain.We have recognized the importance of the calibration of the eye-tracking system and the effect of shifting the head of the subject through the experiments. The calibration has to be made that controls the gain of the signal from the eye-tracking system in order to fit the extent of the eye-movements into the area of the monitor. We have found that the whole system is strongly affected by the head-shift of the subject.