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Ocular microtremor measurement system: design and performance

N F Sheahan¹, D Coakley, F Hegarty

¹Mercer's Institute for Research on Ageing, St. James's Hospital, Dublin, Ireland.

Medical & Biological Engineering & Computing

|May 1, 1993

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Ocular microtremor (OMT) frequency reflects brain stem function, aiding in diagnosing brain stem disorders. Portable OMT systems using piezo-electric transducers are suitable for clinical studies.

Area of Science:

Biomedical Engineering
Neuroscience
Ophthalmology

Background:

Ocular microtremor (OMT) frequency correlates with brain stem functional status.
OMT holds potential for diagnosing and managing brain stem disorders.

Purpose of the Study:

To design and specify portable ocular microtremor measurement systems.
To evaluate the suitability of these systems for clinical applications.

Main Methods:

Development of three portable OMT measurement systems.
Utilization of piezo-electric elements to measure scleral displacement during eye rotations.
Quantitative assessment of system specifications including displacement detection and frequency/phase response.

Main Results:

Related Experiment Videos

All systems detect eye movements from 12 to over 3000 nm.
Frequency responses are flat between 20 and 150 Hz (< 2 dB deviation).
Phase distortion was found to be not excessive for clinical studies.

Conclusions:

The developed portable OMT systems are acceptable for clinical studies.
OMT measurement systems show promise for assessing brain stem function.
These systems can aid in the diagnosis and management of neurological disorders affecting the brain stem.