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Video Report
 역행성 시운동성 안진을 보이는 선천성 안진 1예
이한철1, 양승준2, 김성헌2, 배성훈1orcid
A Case of Congenital Nystagmus Showing Reversed Optokinetic Nystagmus
Han Cheol Lee1, Seungjoon Yang2, Sung Huhn Kim2, Seong Hoon Bae1orcid
Research in Vestibular Science 2023;22(3):95-96.
DOI: https://doi.org/10.21790/rvs.2023.22.3.95
Published online: September 15, 2023

1Department of Otorhinolaryngology, Gangnam severance Hospital, Seoul, Korea

2Department of Otorhinolaryngology, Yonsei University College of Medicine, Seoul, Korea

Corresponding Author: Seong Hoon Bae Department of Otorhinolaryngology, Gangnam Severance Hospital, 211 Eonju-ro, Gangnam-gu, Seoul 06273, Korea Tel: +82-2-2019-3469, Fax: +82-2-3463-4850, E-mail: bshsap@naver.com
• Received: July 28, 2023   • Revised: August 30, 2023   • Accepted: September 1, 2023

Copyright © 2023 by The Korean Balance Society.

This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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A 26-year-old man presented with abnormal eye movement detected during childhood. On examinations, left-beating spontaneous nystagmus and horizontal gaze-evoked nystagmus during visual fixation (Supplementary Video 1). Video-oculography revealed normal saccades and impaired smooth pursuit in the left direction. Notably, the optokinetic nystagmus was reversed (Fig. 1). Moreover, there were no significant findings in the caloric test, video head impulse test, vestibular evoked myogenic potentials and posturography assessments. Ophthalmologic examinations and brain magnetic imaging revealed unremarkable findings.
Previous studies have shown that in patients with congenital ocular disease, reversed optokinetic nystagmus may appear to be either bilaterally or unilaterally [1]. The reversed optokinetic nystagmus can be explained in terms of shifts in the position of the null point which is orbital eye position at which eye velocity is zero of the nystagmus induced by the pursuit or optokinetic stimuli [2]. Reversed optokinetic nystagmus is primarily observed in individuals with congenital nystagmus but can also occur in cases of acquired neurological abnormalities in the central nervous system, cerebellum, or brainstem. The precise cause of congenital nystagmus has not been definitively identified, but it is understood to result from abnormal decussation during the neural pathway’s formation [3].

CONFLICT OF INTEREST

Seong Hoon Bae is the Assistant Editor of Research in Vestibular Science. He was not involved in the review process of this article. All authors have no other conflicts of interest to declare.

FUNDING/SUPPORT

None.

AUTHOR CONTRIBUTIONS

Conceptualization, Methodology: SHB; Data curation: HCL, SY; Formal analysis, Visualization: HCL; Funding acquisition, Supervision: SHK; Project administration: SY; Writing–original draft: HCL; Writing–review & editing: SHB.

All authors read and approved the final manuscript.

Supplementary Video 1 can be found via https://doi.org/10.21790/rvs.2023.22.3.95. Videooculography revealed left spontaneous nystagmus with gaze-evoked nystagmus. Verbal consent was obtained for publication of this report with accompanying clinical image and video.
Fig. 1.
Reversed optokinetic nystagmus. Optokinetic nystagmus showed reversed optokinetic nystagmus in the form of an exponential graph pattern in which the accelerating slow phase form in the right direction was observed when the target moved to the left.
rvs-22-3-95f1.jpg
  • 1. Halmagyi GM, Gresty MA, Leech J. Reversed optokinetic nystagmus (OKN): mechanism and clinical significance. Ann Neurol 1980;7:429–35.ArticlePubMed
  • 2. DellʼOsso LF. Evaluation of smooth pursuit in the presence of congenital nystagmus. Neuro-Ophthalmology 1986;6:383–406.Article
  • 3. Kelly BJ, Rosenberg ML, Zee DS, Optican LM. Unilateral pursuit-induced congenital nystagmus. Neurology 1989;39:414–6.ArticlePubMed

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        A Case of Congenital Nystagmus Showing Reversed Optokinetic Nystagmus
        Res Vestib Sci. 2023;22(3):95-96.   Published online September 15, 2023
        DOI: https://doi.org/10.21790/rvs.2023.22.3.95
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