ABSTRACT
Conventional full-field electroretinogram (ERG) records the summed electrical responses from the entire retina elicited by full-field ‘‘ganzfeld’’ flash stimulation. Under different test conditions, the full-field ERG can assess general rod and cone function separately but cannot adequately detect local retinal dysfunction. For instance, an isolated macular lesion is unlikely to decrease the overall ERG response enough to be detectable by the full-field ERG. On the other hand, a large localized retinal lesion may be detectable by the full-field ERG as a non-specific reduction but no topographical information will be available.
