An electro-oculogram (EOG) can be made to register a subject's eye movements in two dimensions if electrodes above and below the eyeball canthus control the vertical deflectors of a cathode-ray oscilloscope (CRO) and other electrodes on the sides of the eyes control the horizontal deflectors, both channels coming through suitable D. C., drift-free, amplifiers. It has been reported on fairly conclusive ground that the origin of the potentials is the positive polarity of the cornea arising from the corneoretinal potential of the eye. Since the beam of the CRO appears to move as the eye moves, a camera mounted in front of the cathode screen and left open for several seconds will register the pattern of the eye movements in a search or tracking task and the results will be similar to that of the EOG in Figure 1, which was produced in this laboratory. A description and
FORD A. Significance of Terminal Transients in Electro-Oculographic Recordings. AMA Arch Ophthalmol. 1959;61(6):899–906. doi:10.1001/archopht.1959.00940090901005
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