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ALVIN W. NORTH; Accuracy and Precision of Electro-oculographic Recording. Invest. Ophthalmol. Vis. Sci. 1965;4(3):343-348.
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The transorbital potential varies with eye movement. With skin electrodes and DC recording equipment, eye position and movement can be monitored, and the technique is called electrooculography. The potential is assumed to be in large part a projection of the corneoretinal potential, known to vary with illumination. With variation of the corneoretinal potential, identical eye movements will not yield the same potential. It was attempted to minimize the effects of changes of the corneoretinal potential as a source of error in electro-oculography. Twenty experiments were conducted on ten test subjects under conditions of stable and unstable corneoretinal potentials. The possible error due to an unstable corneoretinal potential was demonstrated. Dispersion of the data increased with time since calibration. Within practical limits, error due to an unstable corneoretinal potential can be reduced by calibrations every 10 seconds. A nonlinearity of the function of the sine of angular deviation on eye movement potential was observed with symmetrical eye movements of 15 degrees of arc around the midsagittal plane.
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