Comparison of a newly developed portable type of device for measuring subjective visual vertical with a conventional type of device

Abstract

We investigated the availability of the newly developed portable type of device for measuring subjective visual vertical (SVV). The new device consisted of a monocular telescope-like body and a ring attached to rotate a bar inside the body. The device was fixed on a small board. When subjects looked into the telescope-like body, they found a red bar sign tilted by the examiner. They were then asked to rotate the bar sign to the subjective vertical position using the attached ring. The results using the portable device in 20 healthy subjects and 6 patients with peripheral vestibular disorders showed a close correlation with those using a conventional fixed type of a device, which had a light-emitting diode (LED) bar operated by a joy-stick. This new method requires neither darkroom nor electric power supply. Our results suggested that we could measure SVV with this newly developed device wherever examiners might want.

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

“…A tilt in SVV is the most prominent indication of vestibular imbalance in the roll plane, caused by injuries to the utricle or its connecting nerves [1]. There are many tests measuring SVV, including the hemispheric dome method [1], the light bar in the dark method [2], ocular VEMP (oVEMP) [3], a newly developed software system [4], a monocular portable device [5], and the bucket test [6]. Among them, the bucket test, [7,8], is the simplest and most cost-effective to perform, and thought to have comparable results [6] to other more expensive methods in discriminating asymmetric utricular function.…”