February 1986
Volume 27, Issue 2
Free
Articles  |   February 1986
Diurnal rhythm in the human rod ERG. Relationship to cyclic lighting.
Investigative Ophthalmology & Visual Science February 1986, Vol.27, 268-270. doi:
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      D G Birch, M A Sandberg, E L Berson; Diurnal rhythm in the human rod ERG. Relationship to cyclic lighting.. Invest. Ophthalmol. Vis. Sci. 1986;27(2):268-270.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Five normal subjects were monitored with periodic full-field ERG testing during entrainment to a 14L:10D lighting cycle. On the second day of entrainment, mean ERG threshold was significantly higher 1.5 hr after light onset than at other times of day and was comparable to a previously reported threshold elevation following 7 days of entrainment. This diurnal rhythm was not detectable in eyes entrained for 3 days that were then maintained in darkness for 1 day. The findings support the idea that 2 days of entrainment are required to maximize the diurnal rhythm in the human rod ERG and that an adapting light may be required to trigger this rhythm.

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