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The Test-Retest Reliability of Subjective Visual Horizontal Testing: Comparisons between Solid and Dotted Line Images
Mohd Normani Zakaria1, Nor Haniza Abdul Wahat2, Zuraida Zainun1
1Audiology and Speech Pathology Programme, School of Health Sciences, Universiti Sains Malaysia, Kelantan, Malaysia.
Journal of Audiology & Otology
|January 31, 2020
Summary
Subjective visual horizontal (SVH) testing demonstrated good test-retest reliability using both solid and dotted lines in healthy young adults. This indicates SVH is a temporally reliable clinical tool for assessing horizontality perception.
Area of Science:
- Neuroscience
- Ophthalmology
- Psychophysics
Background:
- Subjective visual horizontal (SVH) is a psychophysical measure assessing an individual's perception of the horizontal plane.
- Reliability of SVH testing is crucial for its clinical application in diagnosing and monitoring visual and vestibular disorders.
Purpose of the Study:
- To evaluate the test-retest reliability of subjective visual horizontal (SVH) testing.
- To compare the reliability of SVH using solid versus dotted line visual stimuli.
- To assess the clinical applicability of SVH in young adults.
Main Methods:
- A repeated measures study design was employed with 36 healthy young adults.
- SVH angles were measured using a computerized device in an upright position.
- Participants perceived horizontality for solid and dotted lines; testing was repeated after one week.
Main Results:
- High test-retest reliability was observed for both solid lines (ICC=0.80) and dotted lines (ICC=0.78).
- Bland-Altman plots confirmed agreement within clinically accepted criteria (±2°) between sessions.
- SVH testing showed temporal reliability, suggesting consistency over time.
Conclusions:
- Subjective visual horizontal testing is temporally reliable for young adults.
- Both solid and dotted line stimuli are suitable for SVH testing in this population.
- SVH testing presents potential clinical benefits due to its demonstrated reliability.
