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The Easy, Accurate and Low-Cost way to measure 
subjective visual vertical in your patients



“a simple, quick, and useful method for detecting PVL (Peripheral Vestibular Lesions) in pediatric patients in the clinic setting.” 
J.R. Brodsky, et al., Peripheral vestibular loss detected in pediatric patients using a smartphone-based test of the subjective visual vertical, Int. J. Pediatr. Otorhinolaryngol. (2015)

Also used in F. Gandor, D. Basta, D. Gruber, W. Poewe, and G. Ebersbach, “Subjective Visual Vertical in PD Patients with Lateral Trunk Flexion,” Parkinson’s Disease, vol. 2016, Article ID 7489105, 4 pages, 2016.


"I would like to commend you for developing such a fantastic application...this application provides an invaluable “bedside” evaluation tool. As I am sure you aware previously such an assessment was only available through costly and inaccessible diagnostic laboratories."
Dr. Daniel Lane, BSc (Chiro) DC (UK) DACNB FFAAFN
Perth, Australia

"Visual vertical" ★★★★★
"Quick n easy, brilliant" 
Baiju italia (Italy) (posted in iTunes)

"great tool" ★★★★★ 
"This is a great app- simple to use and easy to track. I will add this to my exam along with OPK+ and Tremor Tracer apps. Thanks!"
Nancy DC (USA) (posted in iTunes)


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