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. 2016 Jul 29;5(4):8. doi: 10.1167/tvst.5.4.8

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The coefficient of repeatability of the ratio between the b-wave peak to photopic negative response trough amplitude and b-wave peak to a-wave trough amplitude (PhNR/B ratio) are shown and compared between (A) different conditions, and (B) different number of sweeps included. No significant difference in the magnitude of test-retest repeatability was observed between measurements obtained: with the same electrode placed by one examiner (within examiner), with two different electrodes placed by two different examiners (between examiner) and with the same measurements obtained at different sessions (between sessions). However, magnitude of test-retest repeatability improved significantly with increasing number of sweeps used to derive the final trace, though only when comparing those derived from one and three recordings (P = 0.012). Error bars represent the 95% confidence interval of the mean.