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Static Ocular Counterroll: Video-based Analysis After Minimizing the False-Torsion Factors

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Japanese Journal of Ophthalmology Aims and scope Submit manuscript

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° to 50°. 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°. The average (± SD) amplitude of a fitted sine curve was 7.6 ± 3.2° (range: 4.3°–10.3°), and the individual amplitude was significantly larger than the test–retest repeatability of the measurement (±1.7°).

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. Jpn J Ophthalmol 2005;49:497–504 © Japanese Ophthalmological Society 2005

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Authors and Affiliations

  1. Department of Ophthalmology, Okayama University, Graduate School of Medicine and Dentistry, Okayama, Japan

    Ichiro Hamasaki, Satoshi Hasebe & Hiroshi Ohtsuki

Authors
  1. Ichiro Hamasaki
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  2. Satoshi Hasebe
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  3. Hiroshi Ohtsuki
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Corresponding author

Correspondence to Satoshi Hasebe.

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Hamasaki, I., Hasebe, S. & Ohtsuki, H. Static Ocular Counterroll: Video-based Analysis After Minimizing the False-Torsion Factors. Jpn J Ophthalmol 49, 497–504 (2005). https://doi.org/10.1007/s10384-005-0254-4

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  • DOI: https://doi.org/10.1007/s10384-005-0254-4

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