Abstract
The analysis of vertical saccades by electrooculography (EOG) is limited by the presence of wave-form artifacts that occur with both upward and down-ward saccades. The artifacts have been shown to increase the calculated velocities of upward saccades. For better evaluation of the nature of these artifacts, voluntary vertical saccades were recorded by EOG and magnetic search coil in five normal subjects and by EOG only in two patients who had previously undergone enucleation. All subjects demonstrated peaked EOG artifacts during vertical saccades. The amplitude of these artifacts was decreased but not completely eliminated by eyelid or eyeball fixation during the attempted saccade. Peak saccadic velocities were also decreased by eyelid fixation, but EOG measurements were generally less accurate than those obtained by search coil. There is evidence that these artifacts may be the result of a combination of eyelid electrical activity and resistance effects.
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This work was supported by an Unrestricted Development Grant from Research to Prevent Blindness, New York City, NY
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Chioran, G.M., Yee, R.D. Analysis of electro-oculographic artifact during vertical saccadic eye movements. Graefe's Arch Clin Exp Ophthalmol 229, 237–241 (1991). https://doi.org/10.1007/BF00167875
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DOI: https://doi.org/10.1007/BF00167875