Bilateral vestibulopathy and age: experimental considerations for testing dynamic visual acuity on a treadmill
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Bilateral vestibulopathy and age: experimental considerations for testing dynamic visual acuity on a treadmill D. Starkov1,2,11 · M. Snelders1 · F. Lucieer1 · A. M. L. Janssen1,3 · M. Pleshkov1,2 · H. Kingma1,2 · V. van Rompaey4,5 · N. Herssens6,7 · A. Hallemans6,7,8 · L. Vereeck6,7 · C. McCrum9 · K. Meijer9 · N. Guinand1,10 · A. Perez‑Fornos10 · R. van de Berg1,2 Received: 20 February 2020 / Revised: 25 May 2020 / Accepted: 28 September 2020 © The Author(s) 2020
Abstract Introduction Bilateral vestibulopathy (BVP) can affect visual acuity in dynamic conditions, like walking. This can be assessed by testing Dynamic Visual Acuity (DVA) on a treadmill at different walking speeds. Apart from BVP, age itself might influence DVA and the ability to complete the test. The objective of this study was to investigate whether DVA tested while walking, and the drop-out rate (the inability to complete all walking speeds of the test) are significantly influenced by age in BVP-patients and healthy subjects. Methods Forty-four BVP-patients (20 male, mean age 59 years) and 63 healthy subjects (27 male, mean age 46 years) performed the DVA test on a treadmill at 0 (static condition), 2, 4 and 6 km/h (dynamic conditions). The dynamic visual acuity loss was calculated as the difference between visual acuity in the static condition and visual acuity in each walking condition. The dependency of the drop-out rate and dynamic visual acuity loss on BVP and age was investigated at all walking speeds, as well as the dependency of dynamic visual acuity loss on speed. Results Age and BVP significantly increased the drop-out rate (p ≤ 0.038). A significantly higher dynamic visual acuity loss was found at all speeds in BVP-patients compared to healthy subjects (p
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