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Multifocal electroretinogram (1)

Full-field electroretinogram (ERG) is not sensitive for detection of local change of retinal function because of the mass response from the entire retina. Full-field ERG abnormalities are seen with advanced or extensive disease. Multifocal ERG tests locally with focal stimulation using stimulus patterns 61-241 hexagons. (Contributed by Dr. Rosa Ana Tang.)