Impact of Target Distance, Target Size, and Visual Acuity on the Video Head Impulse Test

Impact of Target Distance, Target Size, and Visual Acuity on the Video Head Impulse Test

The video head impulse test (vHIT) assesses the vestibulo-ocular reflex. Few have evaluated whether environmental factors or visual acuity influence the vHIT. The purpose of this study was to evaluate the influence of target distance, target size, and visual acuity on vHIT outcomes. Thirty-eight nor...

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Bibliographic Details
Published in:Otolaryngology-head and neck surgery 2018-10, Vol.159 (4), p.739-742
Main Authors: Judge, Paul D., Rodriguez, Amanda I., Barin, Kamran, Janky, Kristen L.
Format: Article
Language:eng
Subjects:
Adult
Age Factors
Aged
Case-Control Studies
distance
Female
Head Impulse Test - methods
Humans
Male
Middle Aged
Reference Values
Reflex, Vestibulo-Ocular - physiology
Risk Assessment
Saccades - physiology
Sex Factors
target size
vestibular
Vestibular Diseases - diagnosis
Vestibule, Labyrinth - physiopathology
vHIT
vision
Visual Acuity
Young Adult
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Summary:The video head impulse test (vHIT) assesses the vestibulo-ocular reflex. Few have evaluated whether environmental factors or visual acuity influence the vHIT. The purpose of this study was to evaluate the influence of target distance, target size, and visual acuity on vHIT outcomes. Thirty-eight normal controls and 8 subjects with vestibular loss (VL) participated. vHIT was completed at 3 distances and with 3 target sizes. Normal controls were subdivided on the basis of visual acuity. Corrective saccade frequency, corrective saccade amplitude, and gain were tabulated. In the normal control group, there were no significant effects of target size or visual acuity for any vHIT outcome parameters; however, gain increased as target distance decreased. The VL group demonstrated higher corrective saccade frequency and amplitude and lower gain as compared with controls. In conclusion, decreasing target distance increases gain for normal controls but not subjects with VL. Preliminarily, visual acuity does not affect vHIT outcomes.
ISSN:0194-5998
1097-6817