ID | 11741 |
Eprint ID | 11741
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FullText URL | |
Title Alternative | 静的眼球反対回旋:偽回旋の因子を最小限にしたビデオ解析
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Author |
Hamasaki, Ichiro
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Abstract | PURPOSE: To determine the validity and usefulness of a newly developed measurement method of static ocular counterrolling (s-OCR) that eliminates false-torsion factors and to test the Jampel hypothesis that s-OCR does not exist. METHODS: A lightweight measurement device, consisting of a video camera, a coaxial light source, and a laser pointer projecting a fixation target on the wall, was fixed to a subject's head by means of a mouthpiece. In 11 healthy adults (mean age: 30 +/- 15 years), digital images of the right eye were captured while the subject kept his head tilted at a randomly selected angle ranging from 0 degrees to 50 degrees . By a frame-by-frame analysis of movements of the corneal light reflex and the iris patterns, OCR was evaluated. RESULTS: Torsional eye movement in the opposite direction to head tilt was found in all subjects. The amount of torsion continuously increased until the head-tilt angle reached 40 degrees. The average (+/- SD) amplitude of a fitted sine curve was 7.6 +/- 3.2 degrees (range: 4.3 degrees-10.3 degrees), and the individual amplitude was significantly larger than the test-retest repeatability of the measurement (+/-1.7 degrees). CONCLUSIONS: The measurement method used in this study provided good test-retest repeatability and ease of application. The characteristics of torsional eye movements that we observed after minimizing the false-torsion factors agree with previous reports supporting the existence of s-OCR.
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Keywords | eye movement
otolith
static ocular counterroll
video-based analysis
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Note | http://dx.doi.org/10.1007/s10384-005-0254-4
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Published Date | 2007-03-23
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Publication Title | |
Content Type |
Thesis or Dissertation
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Grant Number | 甲第3318号
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Granted Date | 2007-03-23
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Thesis Type |
Doctor of Philosophy in Medical Science
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Grantor | 岡山大学
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Official Url | http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=16365796&dopt=Abstract
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language |
Japanese
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File Version | none
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Refereed |
Unknown
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