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Mobile phone app Vs bucket test as a subjective visual vertical test: a validation study.

Tianyang Dai1, George Kurien2, Vincent Yw Lin3

  • 1Faculty of Medicine, University of Toronto, 1 King's College Cir, Toronto, ON, M5S 1A8, Canada.

Journal of Otolaryngology - Head & Neck Surgery = Le Journal D'Oto-Rhino-Laryngologie Et De Chirurgie Cervico-Faciale
|February 6, 2020
PubMed
Summary

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The Visual Vertical iOS app effectively measures the subjective visual vertical (SVV), offering a reliable and accessible alternative to traditional bedside methods for assessing vestibular function.

Area of Science:

  • Neuroscience
  • Vestibular System Research
  • Clinical Assessment Tools

Background:

  • The subjective visual vertical (SVV) assesses perception of gravitational vertical, crucial for balance.
  • A tilt in SVV suggests vestibular imbalance, potentially indicating utricle or nerve damage.
  • The established bucket method involves aligning a line to vertical in a randomly rotated bucket.

Purpose of the Study:

  • To evaluate the efficacy and accessibility of a Visual Vertical iOS app as a tool for measuring SVV.
  • To compare the performance of the iOS app against the validated bedside bucket method.

Main Methods:

  • SVV measurements were conducted on 22 healthy participants (16 female, 6 male).
  • Each participant completed 10 trials using the bucket test and 10 trials using the iOS app.
Keywords:
Bucket testMobile appSubjective visual vertical testValidation study

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  • Reliability and validity of the iOS app were analyzed using SPSS21.

    • Main Results:

    • The iOS app demonstrated high internal consistency, with Cronbach's α of 0.978 (plumb line method: 0.976).
    • Statistical analysis (Mann Whitney U test) revealed no significant difference in SVV distribution between the iOS app and the bucket method.
    • High reliability indicates the app consistently measures SVV.

    Conclusions:

    • The Visual Vertical iOS app serves as an effective and accessible substitute for the plumb line in the validated bucket test.
    • This digital tool provides a modern, reliable method for assessing the subjective visual vertical.
    • The app facilitates accurate measurement of vestibular function in a clinical or research setting.