The Japanese version of the visual vertigo analogue scale: Reliability and validity.

Area of Science:

• Neuroscience
• Ophthalmology
• Audiology

Background:

• Visual vertigo (VV) is a common symptom following vestibular disorders, characterized by dizziness in dynamic visual environments.
• The Visual Vertigo Analogue Scale (VVAS) assesses VV, but a validated Japanese version was lacking.
• This study addresses the need for a culturally adapted and validated tool for Japanese populations.

Purpose of the Study:

• To translate and cross-culturally adapt the VVAS into Japanese, creating the VVAS-J.
• To evaluate the reliability and validity of the VVAS-J in assessing visual vertigo.
• To provide a standardized instrument for quantifying VV in Japanese patients with vestibular conditions.

Main Methods:

• Standardized translation and cross-cultural adaptation procedures were followed for the VVAS-J.
• Reliability was assessed using internal consistency (Cronbach's α) and test-retest reliability (ICC).
• Validity was evaluated through content, criterion-related (DHI, HADS, stabilometry), and construct validity analyses in patients and controls.

Main Results:

• The VVAS-J demonstrated excellent internal consistency (Cronbach's α = 0.911) and good test-retest reliability (ICC = 0.87).
• VV Severity showed strong correlation with the Dizziness Handicap Inventory (DHI) but weak correlations with HADS and stabilometry.
• VVAS-J scores were significantly higher in patients with vestibular disorders compared to controls, with the highest scores in Persistent Postural-Perceptual Dizziness (PPPD).

Conclusions:

• The VVAS-J is a reliable and valid instrument for quantifying visual vertigo in Japanese patients.
• This validated scale offers a simple and standardized method for assessing VV in clinical and research settings.
• The VVAS-J will aid in the diagnosis and management of visual vertigo in the Japanese population.