Previously submitted to: JMIR Rehabilitation and Assistive Technologies (no longer under consideration since Dec 11, 2017)
Date Submitted: Nov 14, 2017
Open Peer Review Period: Nov 14, 2017 - Dec 4, 2017
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An Immersive System Based on Virtual Reality for the Measurement of Subjective Visual Vertical
Background:
Nowadays, many diagnostic tests used in Medicine and Physiotherapy are performed with expensive, cumbersome and intrusive devices. This is the case of the Subjective Visual Vertical (SVV), a common test for evaluating the perception of verticality. Currently this test is carried out using a collection of home-made devices that include moving planes, buckets, hemispheric domes or projections in dark rooms.
Objective:
Our aim is to develop a flexible, inexpensive, user-friendly and easily extensible system based on virtual reality for several visual diagnostic tests.
Methods:
This article proposes a hardware and software immersive system based on virtual reality for several visual diagnostic tests, with a special interest in the SVV but also including the Subjective Visual Horizontal (SVH), the dynamic SVV, and a rehabilitation exercise: the optokinetic stimulation. A reliability and a usability study were conducted in order to validate our system.
Results:
Two different hardware configurations were tested with 50 healthy subjects. The Intraclass Correlation Coefficient (ICC) was calculated in each device: ICC=0.85 in configuration 1 (CI=0.75-0.92), ICC=0.76 in configuration 2 (CI=0.61-0.87), both with 95% of confidence, which means a substantial reliability. Moreover, 92.2% of patients rated the usability of the system as “Very easy”.
Conclusions:
We propose a simple and affordable virtual reality-based system focused on the measuring of SVV. Using our system also has the advantage of allowing the distribution of the application for rehabilitation of patients at home, using a ubiquitous system.
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