Introduction; About This Manual; Intended Use - Interacoustics EyeSeeCam Instructions D'utilisation

1 Introduction

About this manual

T
his manual is valid for the EyeSeeCam system (revision 1.3). The product is manufactured by:
Interacoustics A/S
Audiometer Allé 1
5500 Middelfart
Denmark
Tel.: +45 6371 3555
Fax: +45 6371 3522
E-mail: info@interacoustics.com
It is the purpose of this manual to provide users of the Interacoustics EyeSeeCam module with all the
information required to carry out safe and reliable measurements.
Dizziness is a frequent symptom in ENT, Neurology, and General Medicine. Part of the clinical
examination of dizzy patients is based on the head impulse test (HIT) of the vestibulo-ocular reflex
(VOR). Head impulses are movements with small positional amplitude (10-20 degrees) but high
acceleration (3.000-6.000 degrees/s2) and high velocity (150-300 degrees/s). When performed
clinically with no quantitative analysis, the test only detects the presence of a corrective saccade as an
indirect sign of a VOR deficit.
The HIT can easily be conducted at the bedside, but it has only a moderate sensitivity (63% in experts
and 72% in non-experts). Its specificity is 78% in experts and 64% in non-experts. Sensitivity,
however, can be improved to up to 100% when quantitative data of the VOR are obtained during the
head impulse. In patients with an acute unilateral vestibular deficit the quantitative HIT is as reliable as
the caloric irrigation test. Chronic patients, however, show a pathological caloric result in only 64% of
the cases but they were reliably identified by quantitative HIT. Hence, in the acute phase of a
vestibular deficit either of these tests is sufficient, but in the chronic phase, which is typical for a
vertigo and dizziness outpatient unit, the quantitative HIT is better.
EyeSeeCam with its lightweight goggles and the integrated inertial measurement unit (IMU) provides a
measurement device for an objective and quantifiable HIT. The mobile setup with a battery-driven laptop
ensures that the HIT can be applied at the patient's bedside and in the emergency room. With it, a doctor
can objectively and reliably assess peripheral vestibular function in a few minutes and differentiate
peripheral from central vertigo. This video-based HIT is a novel, time-saving and low-cost tool that can be
readily applied in all clinical setups, such as in vertigo outpatient units or in emergency rooms.

Intended use

The EyeSeeCam vHIT is used to present information on the performance of the balance system by
providing objective measures of eye-velocity response to head-velocity stimulus, showing the VOR
gain in the plane of rotation of the head
The system is to be used by trained personnel only such as audiologists, ENT surgeons, neurologists,
hearing healthcare professionals or personnel with a similar level of education.
EyeSeeCam vHIT - Instructions for Use - EN Page 1