Evaluating vestibulo-ocular reflex gain characteristics with monocular video head impulse test across different age groups in a healthy population.

This study focuses on assessing high-frequency Vestibulo-Ocular Reflex (VOR) gain values across three pairs of semicircular canals using the EyeSeeCam video head impulse test (vHIT) device in a healthy Chinese population aged 19 to 69 years. Results showed that VOR gain values were stable across age groups but revealed a significant asymmetry between vertical canal planes, with the left anterior-right posterior (LARP) canal gains being higher than right anterior-left posterior (RALP) gains, suggesting a monocular directional preponderance influenced by the left-sided monocular recording setup. Gender differences were minimal, with females exhibiting slightly higher gains in some canal planes. The study emphasizes that normative VOR gain values are specific to the testing device and protocol, recommending that clinical laboratories establish their own reference values tailored to their equipment and procedures.