The multifocal ERG in the diagnosis and follow-up of localized retinal dysfunction: A case report of a patient with CSR

The role of multifocal electroretinography (MF-ERG) in the diagnosis and follow-up of localized areas of retinal dysfunction is discussed. A 42-year-old male with the preliminary diagnosis of optic neuritis in his left eye was referred for evaluation with the MF-ERG. Simultaneous cone ERGs were obtained from 103 locations within the central 50 degrees of the retina. During an 8-month follow-up four MF-ERGs were obtained. Bilaterally reduced paracentral response amplitudes contradicted the preliminary diagnosis. Subsequently central serous chorioretinopathy was diagnosed. Follow-up showed normalization of the MF-ERG responses in the left eye while retinal function in the right eye showed initial worsening. The noninvasive MF-ERG lends itself to follow-up in patients with central serous chorioretinopathy.