Vestibulo-Ocular Responses and Dynamic Visual Acuity During Horizontal Rotation and Translation
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Authors
Ramaioli, Cecilia
Cuturi, Luigi F.
Ramat, Stefano
Lehnen, Nadine
MacNeilage, Paul R.
Issue Date
2019
Type
Article
Language
Keywords
vestibular system , vestibular ocular reflex , oculomotor , dynamic visual acuity (DVA) , otoliths , semicircular canal , retinal slip , eye movements
Alternative Title
Abstract
Dynamic visual acuity (DVA) provides an overall functional measure of visual stabilization performance that depends on the vestibulo-ocular reflex (VOR), but also on other processes, including catch-up saccades and likely visual motion processing. Capturing the efficiency of gaze stabilization against head movement as a whole, it is potentially valuable in the clinical context where assessment of overall patient performance provides an important indication of factors impacting patient participation and quality of life. DVA during head rotation (rDVA) has been assessed previously, but to our knowledge, DVA during horizontal translation (tDVA) has not been measured. tDVA can provide a valuable measure of how otolith, rather than canal, function impacts visual acuity. In addition, comparison of DVA during rotation and translation can shed light on whether common factors are limiting DVA performance in both cases. We therefore measured and compared DVA during both passive head rotations (head impulse test) and translations in the same set of healthy subjects (n = 7). In addition to DVA, we computed average VOR gain and retinal slip within and across subjects. We observed that during translation, VOR gain was reduced (VOR during rotation, mean +/- SD: position gain = 1.05 +/- 0.04, velocity gain = 0.97 +/- 0.07
VOR during translation, mean +/- SD: position gain = 0.21 +/- 0.08, velocity gain = 0.51 +/- 0.16), retinal slip was increased, and tDVA was worse than during rotation (average rDVA = 0.32 +/- 0.15 logMAR
average tDVA = 0.56 +/- 0.09 IogMAR, p = 0.02). This suggests that reduced VOR gain leads to worse tDVA, as expected. We conclude with speculation about non-oculomotor factors that could vary across individuals and affect performance similarly during both rotation and translation.
VOR during translation, mean +/- SD: position gain = 0.21 +/- 0.08, velocity gain = 0.51 +/- 0.16), retinal slip was increased, and tDVA was worse than during rotation (average rDVA = 0.32 +/- 0.15 logMAR
average tDVA = 0.56 +/- 0.09 IogMAR, p = 0.02). This suggests that reduced VOR gain leads to worse tDVA, as expected. We conclude with speculation about non-oculomotor factors that could vary across individuals and affect performance similarly during both rotation and translation.
Description
Citation
Ramaioli, C., Cuturi, L. F., Ramat, S., Lehnen, N., & MacNeilage, P. R. (2019). Vestibulo-Ocular Responses and Dynamic Visual Acuity During Horizontal Rotation and Translation. Frontiers in Neurology, 10. doi:10.3389/fneur.2019.00321
Publisher
Journal
Volume
Issue
PubMed ID
ISSN
1664-2295