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Chen PY, Jheng YC, Huang SE, Po-Hung Li L, Wei SH, Schubert MC, Kao CL. Gaze shift dynamic visual acuity: A functional test of gaze stability that distinguishes unilateral vestibular hypofunction. J Vestib Res 2021; 31:23-32. [PMID: 33325420 PMCID: PMC9249280 DOI: 10.3233/ves-201506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND: Embedded within most rapid head rotations are gaze shifts, which is an initial eye rotation to a target of interest, followed by a head rotation towards the same target. Gaze shifts are used to acquire an image that initially is outside of the participant’s current field of vision. Currently, there are no tools available that evaluate the functional relevance of a gaze shift. OBJECTIVE: The purpose of our study was to measure dynamic visual acuity (DVA) while performing a gaze shift. METHODS: Seventy-one healthy participants (42.79±16.89 years) and 34 participants with unilateral vestibular hypofunction (UVH) (54.59±20.14 years) were tested while wearing an inertial measurement unit (IMU) sensor on the head and walking on a treadmill surrounded by three monitors. We measured visual acuity during three subcomponent tests: standing (static visual acuity), while performing an active head rotation gaze shift, and an active head rotation gaze shift while walking (gsDVAw). RESULTS: While doing gsDVAw, patients with Left UVH (n = 21) had scores worse (p = 0.023) for leftward (0.0446±0.0943 LogMAR) head rotation compared with the healthy controls (–0.0075±0.0410 LogMAR). Similarly, patients with right UVH (N = 13) had worse (p = 0.025) gsDVAw for rightward head motion (0.0307±0.0481 LogMAR) compared with healthy controls (–0.0047±0.0433 LogMAR). As a whole, gsDVAw scores were worse in UVH compared to the healthy controls when we included the ipsilesional head rotation on both sides gsDVAw (0.0061±0.0421 LogMAR healthy vs. 0.03926±0.0822 LogMAR UVH, p = 0.003). Controlling for age had no effect, the gsDVAw scores of the patients were always worse (p < 0.01). CONCLUSION: The gaze shift DVA test can distinguish gaze stability in patients with UVH from healthy controls. This test may be a useful measure of compensation for patients undergoing various therapies for their vestibular hypofunction.
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Affiliation(s)
- Po-Yin Chen
- Department of Physical Medicine and Rehabilitation, Taipei Veterans General Hospital, Taipei, Taiwan, ROC.,School of Medicine, National Yang-Ming University, Taipei, Taiwan, ROC.,Center for Intelligent Drug Systems and Smart Bio-devices-IDS2B, National Chiao Tung University, Hsinchu, Taiwan, ROC.,Department of Physical Therapy and Assistive Technology, National Yang-Ming University, Taipei, Taiwan, ROC
| | - Ying-Chun Jheng
- Department of Physical Medicine and Rehabilitation, Taipei Veterans General Hospital, Taipei, Taiwan, ROC.,School of Medicine, National Yang-Ming University, Taipei, Taiwan, ROC.,Center for Intelligent Drug Systems and Smart Bio-devices-IDS2B, National Chiao Tung University, Hsinchu, Taiwan, ROC.,Department of Physical Therapy and Assistive Technology, National Yang-Ming University, Taipei, Taiwan, ROC
| | - Shih-En Huang
- Department of Physical Medicine and Rehabilitation, Taipei Veterans General Hospital, Taipei, Taiwan, ROC.,School of Medicine, National Yang-Ming University, Taipei, Taiwan, ROC.,Center for Intelligent Drug Systems and Smart Bio-devices-IDS2B, National Chiao Tung University, Hsinchu, Taiwan, ROC.,Department of Physical Therapy and Assistive Technology, National Yang-Ming University, Taipei, Taiwan, ROC
| | - Lieber Po-Hung Li
- School of Medicine, National Yang-Ming University, Taipei, Taiwan, ROC.,Department of Otolaryngology, Cheng Hsin General Hospital, Taipei, Taiwan, ROC.,Faculty of Medicine and Institute of Brain Science, School of Medicine, National Yang Ming University, Taipei, Taiwan, ROC
| | - Shun-Hwa Wei
- Department of Physical Therapy and Assistive Technology, National Yang-Ming University, Taipei, Taiwan, ROC
| | - Michael C Schubert
- Laboratory of Vestibular NeuroAdaptation, Johns Hopkins University School of Medicine, Department of Otolaryngology Head and Neck Surgery, Department of Physical Medicine and Rehabilitation, Baltimore MD USA
| | - Chung-Lan Kao
- Department of Physical Medicine and Rehabilitation, Taipei Veterans General Hospital, Taipei, Taiwan, ROC.,School of Medicine, National Yang-Ming University, Taipei, Taiwan, ROC.,Center for Intelligent Drug Systems and Smart Bio-devices-IDS2B, National Chiao Tung University, Hsinchu, Taiwan, ROC
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