Motor and Servo controller
The System 2000 Rotational Vestibular Chair smoothly accelerates and changes direction without inertial artifact even at higher frequencies and with heavier patients. The dc torque motor in the base and the linear servo amplifier were engineered to provide quiet, precisely controlled rotation in patients up to 400lbs. The complete system can be installed in a traditional 10ft x12ft exam room without expensive AC power modifications or room renovations.
Binocular Video Goggles
Prior to testing, binocular goggles are placed on the patient’s face, both eye images are adjusted for clarity of image, a Velcro strap connects the goggles to the head support for head stability. Then via software, the eye images are centered on the computer screen. During testing, even when the patient slouches in their chair or sits straighter, the eye images can be centered and the tracking adjusted from the computer keyboard without re-entering the booth. These goggles features improve trace quality and reduce testing time.
A true optokinetic stimulus must fill the patient’s visual field. Only a full-field projector can create a perception of self-motion in subjects who stare at the stimuli as it rotates around them. A pinpoint of intense light in the center of the optokinetic drum projects clear stripes on the booth wall from floor to ceiling. These stripes are rotated by a servo motor for OKN tests and the stripes are stationary for vision enhanced VOR tests.