[A canthi-skin electrode electroretinogram, independent of eye movements (author's transl)]

In order to avoid misinterpretation of ERG recordings taken with canthiskin electrodes, the potential deriving from the two electrodes was fed into a balancing amplifier that eliminated opposing voltages and amplified unidirectional voltages. During voluntary as well as nystagmus caused eye movements as well as those caused by nystagmus clearly distinguishable averaged ERG's were recorded.