NORMAL VALUES IN CLINICAL ELECTROOCULOGRAPHY:

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Abstract
Two EOG [electrooculography] parameters, the Arden ratio (A) and an expression devised by Gliem (G), from a sample of normal human subjects are studied. Their relations to the EOG potential and time parameters and to sex, age, pupillary diameter, degree of iris pigmentation, refractive error and axial length, ocular protrusion and interpupillary distance were assessed. Right eye and left eye distributions were congruent, although individual differences were sometimes appreciable, especially in the case of G. The 2 ratios were positively correlated and both showed a negative correlation to the interval between the dark trough and the light peak. Correlations to the EOG potential parameters, especially the light induced potential rise of the dark adapted eye, were also established. In the case of A, a higher level was disclosed in the male half of the sample. A negative age correlation, predominant in the female part of the sample, characterized both ratios. The 2 ratios were positively correlated to the pupil diameter, negatively correlated to the degree of refractive error and positively correlated to the degree of ocular protrusion. The consequences for the clinical EOG test were discussed and it was concluded that the present EOG procedure is a qualitative rather than a quantitative test.

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