The effect of gold foil electrode position on the electroretinogram in human subjects.

Photopic ERGs were recorded in two human subjects using gold foil electrodes mounted at various positions in the lower fornix. The peak to peak amplitude of the b-wave was reduced in both subjects when the centre of the electrode was placed beyond 15 mm from the medial side of the limbus. The implicit time of the a-wave and the b-wave was not dependent on electrode position. These results emphasize the importance of correct placement of gold foil electrodes.