EyeSeeCam vHIT

Video head impulse
testing made clinical

The video head impulse test (vHIT), also known as the head thrust test, is a powerful clinical tool to assess vestibular function. EyeSeeCam vHIT provides quick and objective measurements of the vestibular-ocular reflex (VOR). It efficiently assesses the dizzy patient and determines if the dizziness is related to a vestibular disorder.

Test all six semicircular canals
Data export for clinical research
3D head model for objective feedback on the quality of head impulses
Real-time eye movements and head movements are displayed

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Perform objective head impulses

EyeSeeCam vHIT features an easy guide to let you know when your head impulses are performed at the correct head velocity, which is 150-300 degrees per second. Feedback is given to indicate if your head impulses are in this range, visualized by a shaded area. Head impulses within the shaded area yield a 'ding' sound and a green check mark. Head impulses outside the shaded area yield a 'dong' sound and a red cross mark.

Benefits of the video head impulse test (vHIT)

Covert saccades are not visible without video head impulse test (vHIT) hardware and software. Thus, the traditional bedside or clinical head impulse test (cHIT) is only able to identify overt saccades. Covert saccades are abnormal eye movements that occur during the (video) head impulse test. EyeSeeCam vHIT is able to capture and measure these eye movements, eliminating the risk of false negatives.

A thorough assessment of semicircular-canal function

EyeSeeCam vHIT can be used to measure and display vestibular-ocular reflex (VOR) gains for all six semicircular canals. Vertical canals are tested by thrusting the patient’s head in the 45-degree planes while the patient continues to focus on the target in front of them. There are polar plots in the software to guide you and provide feedback to make sure you are thrusting in the correct planes.

Healthy

The video head impulse test (vHIT) is a measure of the patient's vestibular-ocular reflex (VOR). A patient with healthy vestibular function can keep their eyes focused on a stationary target during head movement.

Disorder

In patients with a vestibular disorder, their eyes will move with the head movement. This requires a corrective eye movement back to the target, also known as a catch-up saccade.

3D head model for accurate testing

Using the 3D head model, you can perform head impulses with confidence. The 3D head model has anatomically correct semicircular canals and provides visual and reliable feedback. The 3D head model is very accurate, as it is integrated with the inertial measurement unit (IMU) in the camera. This means that when the patient turns their head, the 3D head model also rotates. Following a head impulse, the activated semicircular canal will turn red and the inhibited semicircular canal will turn blue. You can view the head model from the front, back, top or either side.

Introducing 3D head model

Head impulse test goggle

The goggle is designed specifically with the head impulse test in mind. Its lightweight and non-slip design helps minimize errors caused by goggle slippage. The snug fit of the goggle allows for testing on both children and adult patients.

Superior eye and head tracking

The goggle has a built-in inertial measurement unit (IMU), which enables accurate assessment of head movements in all planes. The goggle has an interchangeable ball and socket camera for testing either eye. The camera records at 220 Hz for superior eye tracking and accurate recordings of saccades. In addition, the goggle has camera stabilizers for more stable images. The stabilizers reduce oscillations when performing vertical head thrusts.

User-friendly design

No additional hardware is required, as the goggle connects to the computer via USB. In addition, the goggle has a cleanable silicone tubing. The easy-to-clean surface can be cleaned simply with a damp cloth or a wipe.

No shortage of clinical data

After you have completed your video head impulse test (vHIT), instantaneous gain is plotted at different time intervals along with velocity regression gain averages. You can display and edit all the catch-up saccade data in numerical tables with values that can be easily exported.

Gold-standard VOR gain measurements

EyeSeeCam vHIT plots instant gain values at 40, 60 and 80 milliseconds. This prevents possible covert and overt saccades from skewing your test results. The software also plots velocity regression and median 0-100 millisecond gains. This is particularly useful in cases of artifact, as these gains provide an averaged measurement.

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