Removing mains interference from the mfERG by applying a post-processing digital notch filter: for the good or the bad?

Published in: Documenta ophthalmologica. Advances in ophthalmology (2021)

The application of a 50-Hz digital notch filter to mfERG traces causes a mild amplitude reduction which will not normally affect the clinical interpretation of the data. The situation is even more favorable with a 60-Hz digital notch filter. Caution is necessary if the assumption of linear additivity of retinal signal and mains interference is violated.

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