TY - JOUR
T1 - Gaze shift dynamic visual acuity
T2 - A functional test of gaze stability that distinguishes unilateral vestibular hypofunction
AU - Chen, Po Yin
AU - Jheng, Ying Chun
AU - Huang, Shih En
AU - Po-Hung Li, Lieber
AU - Wei, Shun Hwa
AU - Schubert, Michael C.
AU - Kao, Chung Lan
N1 - Funding Information:
This study was funded by the Ministry of Science and Technology (NSC 101-2627-B-075-001-102-2314-B-010 -061-MY3, 107-2314-B-010-010, 108-2314-B-010-042-MY3), Taipei Veterans General Hospital (V108C-152, V105C-077, and V104E14-001-MY3-2), Taipei Veterans General Hospital (VN109-11). This work was financially supported by the “ Center For Intelligent Drug Systems and Smart Bio-devices (IDS2B) “ from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) in Taiwan.
Publisher Copyright:
© 2021 - The authors. Published by IOS Press.
PY - 2021
Y1 - 2021
N2 - 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.
AB - 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.
KW - and vestibular evaluation
KW - dynamic visual acuity
KW - gaze shift
KW - Vestibular hypofunction
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U2 - 10.3233/VES-201506
DO - 10.3233/VES-201506
M3 - Article
C2 - 33325420
AN - SCOPUS:85101217297
SN - 0957-4271
VL - 31
SP - 33
EP - 45
JO - Journal of Vestibular Research: Equilibrium and Orientation
JF - Journal of Vestibular Research: Equilibrium and Orientation
IS - 1
ER -