The Measurement of Eye Movement Using Double Magnetic Induction

This paper describes a new method for the accurate measurement of human eye movements. This eye-contact method is based on double magnetic induction and allows for a lead-free eye coil. The major characteristics of the method are a resolution of 8´ of arc, a linearity of up to 150, and a frequency bandwidth of 3 kHz. The main advantages over methods based on single magnetic induction are pointed out. Further improvement of resolution is discussed based on theory and experiment. Results of measurements on human eye movements are presented. We conclude that our new technique considerably improves eye movement measurement with eye-contact methods, based on magnetic induction. The method is applicable to man and animal.