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A new device to quantify ocular counterroll using retinal afterimages.

Q Arshad¹, D Kaski, D Buckwell

¹Academic Department of Neuro-Otology, Charing Cross Hospital Campus, Imperial College London, London, UK.

Audiology & Neuro-Otology

|May 5, 2011

Summary

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A new head-mounted device reliably measures ocular counterroll (OCR) during head tilt, aiding clinical assessment of otolith function. This non-invasive test shows promise for evaluating vestibular disorders.

Area of Science:

Neuroscience
Ophthalmology
Vestibular System

Background:

Assessing semicircular canal and otolith function is clinically challenging.
Ocular counterroll (OCR) measurement difficulties hinder clinical assessment.
A novel head-mounted device is introduced to quantify static OCR during head tilt.

Purpose of the Study:

To develop and validate a new head-mounted device for measuring ocular counterroll (OCR).
To assess the clinical applicability of the device for evaluating otolith function.

Main Methods:

A head-mounted device uses a light streak and afterimage to measure OCR.
Subjects tilt their head, and a striated lens is rotated to align a light streak with the afterimage.
Validation involved comparing the device's OCR measurements with 3D video-oculography in normal subjects and patients with vestibular loss.

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Main Results:

The new device showed no significant difference compared to 3D video-oculography in normal subjects (R²=0.78).
Patients with bilateral vestibular loss exhibited no measurable OCR using either technique.
The results demonstrate high correlation and agreement between the novel device and established methods.

Conclusions:

A non-invasive, quick, and reliable test for ocular counterroll has been developed.
The device's ability to detect absent OCR in vestibular patients confirms its clinical utility.
This technology offers a valuable tool for assessing otolith function in clinical settings.