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Investigative Ophthalmology & Visual Science, Vol 27, 268-270, Copyright © 1986 by Association for Research in Vision and Ophthalmology

ARTICLES AND REPORTS

Diurnal rhythm in the human rod ERG. Relationship to cyclic lighting

DG Birch, MA Sandberg and EL Berson

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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Copyright © 1986 by the Association for Research in Vision and Ophthalmology