The purpose of the study was to appraise the added benefit of RS parameters alongside the VOR gain values towards the improvement of the vHIT diagnostic accuracy. Specifically, the horizontal vHIT (hvHIT) results of patients with leftward VOR gain values <0.8, currently defined as pathological (2,4,5,6,7,16), which was registered by right eye position of the testing system camera, were retrospectively evaluated for the presence of RS. The contribution of low VOR gain values with and without the addition of RS findings to the patients’ final diagnosis of left vestibular dysfunction was analyzed. The focus of our study was on the diagnosis of left horizontal canal dysfunction as the mono-ocular right eye placement of the recording camera, might introduce potential bias of lower leftwards VOR gain values (4,6,9,11,15).