Effect of shorter dark adaptation on ISCEV standard DA 0.01 and DA 3 skin ERGs in healthy adults

Purpose To quantify dark-adapted (DA) skin ERG changes during 20 min of dark adaptation. Methods Sixteen healthy adult subjects were dark-adapted for 20 min during which ISCEV standard dim (0.01 phot cd s m −2 ) white flash ERGs were recorded at 1, 2, 3, 4, 5, 10, 15 and 20 min, and bright (3 phot c...

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Bibliographic Details
Published in:Documenta ophthalmologica 2016-08, Vol.133 (1), p.11-19
Main Authors: Hamilton, R., Graham, K.
Format: Article
Language:English
Subjects:
Adult
Dark Adaptation - physiology
Electrodes
Electroretinography - methods
Electroretinography - standards
Female
Humans
Male
Medicine
Medicine & Public Health
Middle Aged
Ophthalmology
Original Research Article
Photic Stimulation - methods
Time Factors
Young Adult
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Summary:Purpose To quantify dark-adapted (DA) skin ERG changes during 20 min of dark adaptation. Methods Sixteen healthy adult subjects were dark-adapted for 20 min during which ISCEV standard dim (0.01 phot cd s m −2 ) white flash ERGs were recorded at 1, 2, 3, 4, 5, 10, 15 and 20 min, and bright (3 phot cd s m −2 ) white ERGs were recorded at 2, 5, 10, 15 and 20 min without mydriasis and using skin electrodes. Amplitudes and peak times were normalised to 20 min values. Results Halving dark adaptation from 20 to 10 min had no measureable effect on the DA 3 ERG and caused a 10 % amplitude loss (range 0–23 %) only for the DA 0.01 ERG b-wave amplitude. No significant peak time changes resulted, nor increased parameter variability. Conclusion Reducing dark adaptation from 20 to 10 min or even less has an effect on only DA 0.01 ERGs. Shorter dark adaptation than 20 min may not compromise the clinical utility of the ERG providing clinics adhere to the usual standards of adequate reference data.
ISSN:0012-4486
1573-2622
DOI:10.1007/s10633-016-9554-x