Nystagmography During Counterrolling of the Eyes in Man

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Abstract
Anyone who has reviewed the literature of the last 10 years on the various methods of nystagmography has no doubt been struck by the preference given to electronystagmography over other techniques. Electronystagmography has many advantages. It is easy for both examined and subject. It does not entail a great deal of expense as long as there is an opportunity to make use of an existing electroencephalograph or electrocardiograph. There are, however, a few shortcomings, especially when exact computations are needed. The cornea-retina potential, the source of the electric energy of which the fluctuations are recorded, shows a quantitative correlation with light adaptation, according to a series of experiments by G. and J. ten Doesschate.1 Consequently, experiments can be executed only in the dark, and even so calibration at regular intervals is necessary. The plane of calibration should be the plane of the nystagmus. According to Lansberg,2 the direction
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