RECORDING EYE-MOVEMENTS USING COAXIAL CAMERAS - APPLICATIONS FOR VISUAL ERGONOMICS AND READING STUDIES

We developed a system of coaxial video cameras that records monocular eye position and scene, and superimposes these images using a digital video mixer. We mounted miniature video cameras above and below a cube beam-splitting prism in the spectacle plane. An infrared emitting dio de was imaged in the cornea to locate eye position. The technique was accurate to about 0.5 degrees within 15 degrees of primary gaze; howev er, we see its main advantages as being its low cost and simple design that, for some applications, does not require complex computer analys is and data manipulation. With improved camera optics, it has the pote ntial for helmet mounting and use remote from a recording console. We used the instrument to monitor a reader's eye position when using low vision devices, and see applications of the technique in the field of visual ergonomics and sports vision.