D-0134090-A – 2022/11
VisualEyes™ - Instructions for Use - EN Page 87
3.9.4 EyeSeeCam vHIT
The test is performed with the EyeSeeCam goggle, and includes subtests for Lateral, RALP, and LARP vHIT
testing, along with the SHIMP test. Ensure that the patient is seated in an upright position and 1.5 meters
away from the wall on which the red laser dots are projected on to. Before testing, conduct the calibration as
described in section 3.7.3.
3.9.4.1 Lateral VHIT
The Lateral vHIT test assesses the function of the lateral semicircular canals. For this test, hold the patient’s
jaw while standing behind the patient (
Figure 3.9-4). During the test, the patient’s teeth should be clenched so
the hand thrust will be transferred to the patient’s head. Practice a few impulses before recording. This will
also familiarize the patient with the stimulus. Do not allow the hands to touch or move the goggles during
head impulses as that movement will affect the gain measurement.
Figure 3.9-4 Lateral vHIT hand placement
3.9.4.2 Left Anterior Right Posterior (LARP) / Right Anterior Left Posterior (RALP) vHIT
The LARP and RALP tests assess the function of the vertical semicircular canals. The head is rotated
right-downward to left-upward in the plane of the right anterior and left posterior canals (RALP) or
left-downward to right-upward in the plane of the left anterior and right posterior canals (LARP). Alternatively,
the head can be rotated 45 degrees to the right for LARP testing and 45 degrees (
Figure 3.9-5) to the left for
RALP testing. The patient must always gaze straight ahead.
Figure 3.9-5 vHIT testing with head-on gaze and corrected straight gaze in LARP testing
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