Electrodiagnostic Tests in Eye Disease

Abstract

(Jacobson, 1961). Basis of the Electro-OculogramThe EOG is concerned with the slower changes in the standing potential of the eye rather than the rapid activity of the retinal neurones which produces the ERG. This standing potential can be measured using the "eye movement technique" in which electrodes are placed on either side of the eye and the eye moved from side to side. The potential difference induced between the two electrodes is then proportional to the standing potential on the eye and is recorded.In the clinical test, there is an initial drop in the standing potential during a period of dark adaption, followed by an increase in potential occuring over several minutes when the eye is subsequently exposed to light. This is the basis of the EOG (Arden, Barrada and Kelsey, 1962