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Electronystagmography in objective assessment of visual acuity. A 13-year experience Rokuro Makabe 1 1Dept of Ophthalmol, Frankfurt Univ Sch of Med pp.645-649
Published Date 1989/4/15
DOI https://doi.org/10.11477/mf.1410210752
  • Abstract
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Horizontal optokinetic nystagmus is inhibited by a light spot of 11 arc minutes projected onto the center of the screen of an electronystagmograph of Jung. The minimum light intensity that just inhibits optokinetic nystagmus is registered and is compar-ed with the visual acuity in the conventional sense.

Based on a series of examinations in 444 eyes in 226 patients with various diseases except amb-lyopia, a diagram was obtained with allows deduc-tion of visual acuity from the spot intensity with a fair grade of accuracy.

In another series of experiment, a pattern consist-ing of numerous light spots of 3 arc minutes isprojected over the whole screen and is rotated at an angle velocity of 40°per second. The minimum light intensity that just provokes an optokinetic nystag-mus is registered. The value was not well correlat-ed with the visual acuity in the conventional sense.

In practical use, the visual acuity was roughly estimated by nystagmus provocation method. The value was then carefully measured by the nystag-mus inhibition method. This procedure allowed correct diagnosis in 302 eyes of 179 patients who were clinically judged as simulation or aggrava-tion.


Copyright © 1989, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1308 印刷版ISSN 0370-5579 医学書院

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