Imperial College London
Alternate

Dr Qadeer Arshad

Faculty of Medicine, Faculty of Medicine Centre

Honorary Clinical Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 3313 5527q.arshad

 
 
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Location

 

Lab BlockCharing Cross Campus

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Summary

 

Publications

Citation

BibTex format

@article{Castro:2018:10.1159/000493845,
author = {Castro, P and Sena, Esteves S and Lerchundi, F and Buckwell, D and Gresty, M and Bronstein, A and Arshad, Q},
doi = {10.1159/000493845},
journal = {Audiology and Neurotology},
pages = {285--289},
title = {Viewing target distance influences the vestibulo-ocular reflex gain when assessed using the video head impulse test},
url = {http://dx.doi.org/10.1159/000493845},
volume = {23},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Gaze stabilization during head movements is provided by the vestibulo-ocular reflex (VOR). Clinical assessment of this reflex is performed using the video Head Impulse Test (vHIT). To date, the influence of different fixation distances on VOR gain using the vHIT has not been explored. We assessed the effect of target proximity on the horizontal VOR using the vHIT. Firstly, we assessed the VOR gain in 18 healthy subjects with 5 viewing target distances (150, 40, 30, 20, and 10 cm). The gain increased significantly as the viewing target distance decreased. A second experiment on 10 subjects was performed in darkness whilst the subjects were imagining targets at different distances. There were significant inverse relationships between gain and distance for both the real and the imaginary targets. There was a statistically significant difference between light and dark gains for the 20- and 40-cm distances, but not for the 150-cm distance. Theoretical VOR gains for different target distances were calculated and compared with those found in light and darkness. The increase in gain observed for near targets was lower than predicted by geometrical calculations, implying a physiological ceiling effect on the VOR. The VOR gain in the dark, as assessed with the vHIT, demonstrates an enhancement associated with a reduced target distance.
AU  - Castro,P
AU  - Sena,Esteves S
AU  - Lerchundi,F
AU  - Buckwell,D
AU  - Gresty,M
AU  - Bronstein,A
AU  - Arshad,Q
DO  - 10.1159/000493845
EP  - 289
PY  - 2018///
SN  - 1420-3030
SP  - 285
TI  - Viewing target distance influences the vestibulo-ocular reflex gain when assessed using the video head impulse test
T2  - Audiology and Neurotology
UR  - http://dx.doi.org/10.1159/000493845
UR  - http://hdl.handle.net/10044/1/64943
VL  - 23
ER  -
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