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D G Birch, E L Berson, M A Sandberg; Diurnal rhythm in the human rod ERG.. Invest. Ophthalmol. Vis. Sci. 1984;25(2):236-238.
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Six normal subjects, monocularly entrained to a 14 hr light/10 hr dark cycle, showed a diurnal rhythm in the rod ERG of the entrained eye but not the unentrained eye. Thresholds in the entrained eye were significantly higher 1 1/2 hrs after light onset than at other times. This threshold increase occurred at a time when rod disc shedding has been observed histologically to be maximal in light-entrained animals.
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