Journal of Nippon Medical School: Vol.71 No.1 page.025

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ArticleTitle A Comparative Study on the Observation of Spontaneous Nystagmus with Frenzel Glasses and an Infrared CCD Camera

AuthorList Shunkichi Baba, Akiko Fukumoto, Mio Aoyagi, Yasuo Koizumi, Tetsuo Ikezono and Toshiaki Yagi

Affiliation Department of Otolaryngology, Nippon Medical School

Language EN

Volume 71

Issue 1

Year 2004

Page 25-29

Received May 26, 2003

Accepted August 17, 2003

Keywords video, slow phase velocity, frequency, amplitude, routine examination

Abstract Objectives: To compare the usefulness of a CCD camera with infrared illumination (IR-CCD camera) over Frenzel glasses (F Glasses) for the observation of spontaneous nystagmus, the incidence and direction of nystagmus, and the frequency, amplitude and slow phase of spontaneous nystagmus.
Methods: One hundred vertiginous patients, fifty-three females and forty-seven males participated in this study. Before undergoing routine neurotological examination, their eye movements were recorded by electronystagmogram (ENG) in conjunction with observations of eye movements under F glasses and through an IR-CCD camera. The data was collected from patients who exhibited spontaneous nystagmus either under F glasses or the IR-CCD camera.
Results: Thirty-three patients showed spontaneous nystagmus under F glasses. On the other hand, under the IR-CCD camera, all patients examined exhibited spontaneous nystagmus. The frequency of nystagmus was not significantly different between these two systems. However, the amplitude and slow phase velocity exhibited significantly larger values under the IR-CCD camera in patients with spontaneous nystagmus both under the IR-CCD camera and F glasses.
Conclusion: From these observations and evidence, the IR-CCD camera can be recommended as a more useful system and powerful tool for neurotological examination than F glasses.

Correspondence to Correspondence to Toshiaki Yagi, MD, Ph D, Department of Otolaryngology, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo 113-8603, Japan
yagi@nms.ac.jp

ArticleTitle	A Comparative Study on the Observation of Spontaneous Nystagmus with Frenzel Glasses and an Infrared CCD Camera
AuthorList	Shunkichi Baba, Akiko Fukumoto, Mio Aoyagi, Yasuo Koizumi, Tetsuo Ikezono and Toshiaki Yagi
Affiliation	Department of Otolaryngology, Nippon Medical School
Language	EN
Volume	71
Issue	1
Year	2004
Page	25-29
Received	May 26, 2003
Accepted	August 17, 2003
Keywords	video, slow phase velocity, frequency, amplitude, routine examination
Abstract	Objectives: To compare the usefulness of a CCD camera with infrared illumination (IR-CCD camera) over Frenzel glasses (F Glasses) for the observation of spontaneous nystagmus, the incidence and direction of nystagmus, and the frequency, amplitude and slow phase of spontaneous nystagmus. Methods: One hundred vertiginous patients, fifty-three females and forty-seven males participated in this study. Before undergoing routine neurotological examination, their eye movements were recorded by electronystagmogram (ENG) in conjunction with observations of eye movements under F glasses and through an IR-CCD camera. The data was collected from patients who exhibited spontaneous nystagmus either under F glasses or the IR-CCD camera. Results: Thirty-three patients showed spontaneous nystagmus under F glasses. On the other hand, under the IR-CCD camera, all patients examined exhibited spontaneous nystagmus. The frequency of nystagmus was not significantly different between these two systems. However, the amplitude and slow phase velocity exhibited significantly larger values under the IR-CCD camera in patients with spontaneous nystagmus both under the IR-CCD camera and F glasses. Conclusion: From these observations and evidence, the IR-CCD camera can be recommended as a more useful system and powerful tool for neurotological examination than F glasses.
Correspondence to	Correspondence to Toshiaki Yagi, MD, Ph D, Department of Otolaryngology, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo 113-8603, Japan yagi@nms.ac.jp