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In electroretinography A multifocal electroretinogram (ERG) is used to record separate responses for different retinal locations.

Electroretinograms can be broken down into three components:

Depending on the species the ERG is taken from, the c-wave may be positive, negative, or absent in part or in whole.[1]


  1. Clinical Electrophysiology,Donnell Creel, date unknown (accessed 19 January,2007)

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