Unilateral electronegative ERG in a presumed central retinal artery occlusion
Luiz H Lima1, Wener Cella2,4, Claudia Brue5, Stephen H Tsang2.3
1Federal University of Sao Paulo (UNIFESP), Sao Paulo, Brazil; 2Department of Ophthalmology, 3Bernard and Shirlee Brown Glaucoma Laboratory, Edward S Harkness Eye Institute and Departments of Opthamology, Pathology and Cell Biology, Columbia University, New York, NY, USA; 4Department of Ophthalmology, University of Brasilia, Brasilia, Brazil; 5Department of Opthamology, University Politecnica delle Marche, Ancona, Italy
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.
Keywords: central retinal artery occlusion, electronegative ERG, inner retina, spectral domain optical coherence tomography