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  • Title: Circadian rhythms and variability of the clinical electro-oculogram.
    Author: Anderson ML, Purple RL.
    Journal: Invest Ophthalmol Vis Sci; 1980 Mar; 19(3):278-88. PubMed ID: 7358478.
    Abstract:
    Clinical electro-oculograms (EOGs) were recorded from six normal subjects over 24 hr time periods for a total number of 70 EOG'S. Results indicate an inverse relationship exists between the light/dark (L/D) ratio and the dark-trough potential. No relationship was found between the light-peak potential and the L/D ratio. Both the dark-trough potential and the L/D ratio showed a circadian periodicity over working daylight hours and rather aberrant behavior in late evening and early morning hours. Circadian contributions to the L/D ratio are estimated to be between 20% and 50% of the total variability in the normal individuals studied. We suggest the optimal time for single measurements of EOG pathology should be around midday.
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