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Updated: Jun 6, 2026

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Multifocal Electroretinograms
Published on: December 4, 2011
Unilateral electronegative ERG in a presumed central retinal artery occlusion
Luiz H Lima1, Wener Cella, Claudia Brue
1Federal University of Sao Paulo (UNIFESP), Sao Paulo, Brazil.
Clinical Ophthalmology (Auckland, N.Z.)
|December 9, 2010
Abstract:
A unilateral electronegative electroretinogram (ERG) was seen in a 94-year-old man with presumed central retinal artery occlusion. Goldmann perimetry revealed central scotoma in the right eye and no abnormalities in the left eye. Full-field ERG in the right eye described a reduction of the b-wave with a relative preservation of the a-wave which is characteristic of electronegative ERG. Hence, our case illustrates that ERG testing is essential for the work-up of individuals with suspected retinal vascular disorders.

