Virtual SVVTM

Solutions / ABR / OAE

Spatial orientation and sensory-motor coordination rely on the accurate perception of gravity. The inner ear vestibular system provides the essential information for these tasks. Virtual SVVTM can be utilized to subjectively evaluate vestibular and otoneurologic function, while providing detailed quantitative data analysis.
  • Subjective measures with quantitative data analysis
  • Compact device for behavioral evaluation of vestibular and otoneurologic function
  • Sensitive to tilt at different head positions
  • Game-like procedure is easy to understand and fun for children

Functional testing of the utricles

The Virtual SVVTM aids in the diagnosis and rehabilitation of vestibular dysfunction. It provides a simple and non-invasive behavioral technique for differential diagnosis of the vestibular apparatus, and in particular, of the otolith organs. Measurement of the subjective visual vertical permits functional testing of the utricles.
An individual with a healthy otolith system can easily determine what is vertical with great precision. The estimation of the subjective visual vertical thus serves as a behavioral evaluation of utriclular function. Clinical research has already demonstrated that isolated utricular dysfunction can occur.
Virtual SVVTM complements the traditional vestibular assessment battery, allowing you to accurately test all 10 balance organs in every patient.

Base station and software

The base station is connected to a standard USB port on the Windows PC. The base station communicates with the virtual reality goggle via via a wireless receiver and transfers the measurement data to the software.

The Virtual SVVTM software provides the operator with a comprehensive online real-time display for the monitoring of the patient’s head position and angle of the luminous line while the patient is performing the task. Throughout the test procedure the deviation of the luminous line from the true vertical is displayed. Each SVV estimate confirmed by the patient is entered on a chart against the expected threshold range. Upon completion of the examination all data are stored and a report sheet is generated that can be output in PDF or hardcopy form.

Virtual reality goggle and handheld remote

The lightweight, light-occluding virtual reality goggle provides the patient with a display of the luminous line, which can be rotated using the buttons on the wireless handheld remote. Integrated into the goggle is a sensor that provides continuous information on the head position.

Exchangeable foam face cushions allow for form fitting to each individual’s face, ensuring the occlusion of any ambient light during the examination.

The rechargeable battery provides for operation over several hours. It is automatically recharged when placed in the cradle of the base station.

Static tilt upright

Static testing performed with the head in an upright position provides the examiner with more precision than the traditional SVV bucket test.

In the presence of an otolith disorder the patient is likely to experience a sensation of tilt and accordingly, will set the luminous line with some deviation relative to head axis, i.e. relative to gravity.

Static tilt angles

Unlike the traditional SVV bucket test, the head sensor in the Virtual SVVTM goggle allows for additional testing to be conducted at multiple static tilt head positions for a more comprehensive evaluation.
The game like nature of the test is intuitive for children. Children love wearing the goggle and using the joystick, makes it more appealing than the bucket test. Very user friendly and easier for children to understand the goal of the test. Overcomes the ability of the bucket to take into consideration head position. A great tool, particularly as the role of SVV in the clinical evaluation is expanding. Excellent tool for behaviorally assessing the impact of vestibular end-organ (utricular) function. May better estimate the functional impact of vestibular end-organ (utricular) function.
– Otolaryngologist Hospital for Sick Children Toronto, ON. Dr. Sharon Cushing

The game-like nature of the test procedure allows for a behavioral measure of vestibular end-organ function in pediatric patients.

The goggles are fitted with movement sensors to allow for SVV testing to be performed at multiple static tilt angles.