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Abstract
The authors designed an eye movement recording system that makes use of the advantages of infrared technique but overcomes the disadvantages of such analog systems. Their system employs infrared illumination of each eye by light emitting diodes (LEDs). A mirror transparent for visible light yet reflective for infrared light projects the light reflected from each iris plane onto a linear array of 1,024 photo diodes. A video signal is generated from the output of the photo diodes, and associated electronics determine the margin of the pupil's space. The addresses of the appropriate diodes are read by a microprocessor and the data available for computer storage and analysis. This allows for a linear range of 30°, spatial resolution of greater than 0.1°, temporal resolution of 4 msec, and the simultaneous recording of each eye. Data can be presented on oscilloscope, as numerical printout, or mapped graphically.