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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:

• an initial a-wave, caused by extracellular ionic currents generated by photoreceptors during phototransduction,
• the b-wave, which corresponds to bipolar cell activity,
• and the later c-wave, which is generated by the retinal pigment epithelium and Müller cells.

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

ReferencesEdit

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