Evaluations upon Objective and Quantitative Monocular Nystagmus Analysis by Polygraphic ENG from 1970 till 2010
Abstract
Evaluations upon Objective and Quantitative Monocular Nystagmus Analysis by Polygraphic ENG from 1970 till 2010
Nagy Elemer, et all
Electronystagmography is the superior test analyzing eye movements with open and with closed eyes. The nystagmus signals to be generated by the human central nervous system start after the age of the 27th after procreation.
The difficulty in electronystagmography is that the potentials created by the ocular bipolar indicator are much less in comparison to electrocardiography. Electrocardiography is working with potentials of 100 mV, whereas electronystagmography only can use potentials of 10 mV or less.
By electronystagmography, we can build up vector derivation fields in the horizontal axis between the left temporal facial skin surface over the back of the nose to the right temporal skin. This derives the horizontal movements, whereas the vertical movements are derived by pairs of electrodes above and beneath the eyes.
In the beginning, a binocular horizontal couple deriving the capacity of the two batteries from the right and the left eye over the two temporal parts of the facial skin were used. Later, the monocular recording was added with a 5-channel-technology as being used by Claussen. This means, a couple of electrodes used for the classical binocular horizontal derivation and then, 4 further channels are using the derivation of the eye movements horizontally above the right and the left eye and vertically over the right and the left eye.
When applying a multichannel electronystagmography, it easily can be found out that the eye movements are not completely congruent on the right and on the left eye. Dissociations are regular to occur. Usually, the human has a leading and a following eye.
