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Effects of Brightness of Infrared CCD Camera to Frenzel's Glasses on Detecting Vestibular Nystagmus Takao Yabe 1 1Department of Otolaryngology, Teikyo University School of Medicine pp.51-54
Published Date 1998/1/20
DOI https://doi.org/10.11477/mf.1411901715
  • Abstract
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We investigated the differences in detecting ves-tibular nystagmus between the infrared CCD cam-era (0 Lux) and Frenzel's glasses (500 Lux). Fifteennormal subjects were examined. ENG recordings of the ice water caloric test were performed under both conditions. The results were as follows ; mean maximum slow phase velocity : 40.8 deg/sec with CCD and 23.4 deg/sec with Frenzel, mean number of nystagmus : 411.3 with CCD and 242M with Frenzel, mean duration : 332.5 sec with CCD and 180.3 sec with Frenzel, respectively. Infrared CCD camera was 1.7 to 1.8 times more sensitive than Frenzel's glasses. It is conceivable that these differences are due to the visual suppression on vestibulo-ocular reflexes from the brightness gap of both conditions.


Copyright © 1998, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1316 印刷版ISSN 0914-3491 医学書院

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