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GENERAL INFORMATION
INTENDED USES
VNG Plus is a Videonistagmógrafo whose intended use is register, reproduce and
analyze the involuntary eyes movements (Nystagmus).
The eyes movements (Nystagmus) are recorder through the cameras mounted on the
mask. These images are processed, and stored, for later review.
This information is used by a trained professional to diagnose pathologies of the
central and peripheral vestibular system such as otorrinolaryngologists, neurologists,
balance disorders specialist or properly trained medical personnel.
The VNG plus has a basic unit for peripheral vestibular exploration, and accessories
that constitute an expanded system that allows to evaluate the VOR and the central
vestibular system through oculomotor stimulation.
INTENDED USER
VNG Plus has been designed to be used by health professionals with experience in
the technique.
OPERATING PRINCIPE
The VNG goggles hold the cameras that are used to record the eye images. The
cameras use infrared light (IR), which is not visible to the naked eye. The IR
illumination enables sessions to be performed in complete darkness. The mirrors
simultaneously direct IR illumination toward the pupil and reflects an image of the
eye back to the video camera. The mirror reflects short wave infrared (~700-800 nm)
and passes visible wavelengths.
The VNG goggles can function in both free field of view and light occluding mode.
The front cover plate of the mask is magnetically fixed and can easily be removed.
Patient-stimulus relative position and head angles record and
tracking
VNG Plus has two different kinds of sensors to monitor test
conditions:
Ultrasound sensor to get 3D static patient position relative to visual
stimulator: It is consisting on ultrasound receptor positioned on to visual
stimulator and an ultrasound emitter, located on goggles. System measures
the patient head position relative to the center of visual stimulator.
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