Electroretinography

The electroretinogram (ERG ) is a diagnostic tool for the study of retinal function. In this case, light stimuli are applied and recorded electrical potentials formed thereon from the retina by a plurality of electrodes. These potentials reflect the electrical activity of the rods and cones, and bipolar cells. A distinction is made between scotopic ( dark-adapted ) and photopic ( light adapted ) conditions. In scotopic conditions, the cones are mainly the rods in photopic conditions tested. The investigation is used, for example in the context of follow-up of retinitis pigmentosa. When full-field electroretinogram disorders that only affect the macula remain mostly hidden, so in Va Disorder of the central visual field, the multifocal electroretinogram ( mfERG ) is applicable. In this case the patient changing light stimuli for certain areas of the retina are offered and calculates the response curve for each area of ​​the retina separately.