ABSTRACT
The purpose of this chapter is to provide the reader with a working knowledge of functional testing of the retina by describing the most common procedure used for that purpose-namely, the electroretinogram whether evoked to a diffuse (flash ERG) or structured (pattern ERG and multifocal ERG) light stimulus. It is not, however, the scope of this chapter to discuss in great details the origin of the different components of the ERG, especially since for several of them this is still an unresolved issue.
