ABSTRACT

While the ERG is a transient retinal electrophysiologic response to a brief light stimulus, the electro-oculogram (EOG) is a measure of the continuous resting electrical potential across the retina. This standing potential was discovered by DuBois-Raymond in 1849, and the term ‘‘electro-oculogram’’ was introduced by Marg in 1951 (1,2). The EOG is a clinically useful test in conditions such as Best disease, but its clinical applications are not as extensive as the ERG. Standard for clinical EOG has been established by the International Society for Clinical Electrophysiology of Vision (ISCEV) since 1993 and the most updated version is available on the ISCEV Internet site (3). The clinical EOG standard is reviewed every 3 years, and no significant revision has occurred. A summary of the standard is provided in Table 4.1.