[The use of computer electronystagmography in the assessment of optokinetic nystagmic reactions].

A novel technique of computer-assisted electronystagmography (CENG) has been used in 90 patients with vertigo. Two variants of optokinetic nystagmus (cortical and subcortical) were analysed. Registration of optokinetic nystagmus (OKN) was carried out using original devices for CENG. Right- and left-directed nystagmic reactions and their quantitation were performed according to specially devised registering and analysing programs. In one-sided vestibular disorders cases of cross-over OKN asymmetry prevailed in affection of the cerebellopontine angle (neurinoma of the VIII nerve) compared to labyrinthine disturbances (one-sided Meniere's disease). In 90% of patients with vertebrobasillar deficiency OKN asymmetry was found even in a straight position of the head. OKN asymmetry was less pronounced or disappeared in the OKN test performed with the head turned right or left by 90 degrees.