Objective: The objective is to investigate the test-retest reliability of subjective visual vertical (SVV) in the upright position and with lateral head tilts through a computerized SVV measuring system using virtual reality (VR) goggles.
Materials And Methods: Thirty healthy controls underwent SVV test in upright position, with the head tilted to the right 30°, and with the head tilted to the left 30°. Subjects wore SVV VR goggles, which contained a gyroscope for monitoring the angle of head tilt. Each subject completed 10 adjustments in each head position. The mean value of SVV deviations and SVV imprecision (the intra-individual variability of SVV deviations from the 10 adjustments) were recorded and compared across different head positions. The participants then repeated the same SVV protocol at least 1 week later. The test-retest reliability of SVV deviation and SVV imprecision were analyzed.
Results: The SVV deviation (mean ± standard deviation) was 0.22° ± 1.56° in upright position, -9.64° ± 5.91° in right head tilt, and 7.20° ± 6.36° in left head tilt. The test-retest reliability of SVV deviation was excellent in upright position (intra-class correlation coefficient [ICC] = 0.77, < 0.001), right head tilt (ICC = 0.83, < 0.001) and left head tilt (ICC = 0.84, < 0.001). The SVV values from the 10 adjustments made during right and left head tilts were less precise than when measured at upright ( < 0.001). The test-retest reliability of SVV imprecision was poor at upright (ICC = 0.21, = 0.26) but fair-to-good in right head tilt (ICC = 0.72, < 0.001) and left head tilt (ICC = 0.44, = 0.04).
Conclusion: The test-retest reliability of SVV deviation during lateral head tilts via VR goggles is excellent, which supports further research into the diagnostic value of head-tilt SVV in various vestibular disorders. In addition, the degree of SVV imprecision during head tilt has fair-to-good test-retest reliability, which suggests SVV imprecision may have clinical applicability.
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| http://dx.doi.org/10.4103/tcmj.tcmj_207_20 | DOI Listing |
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