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Digital measurement of ocular microtremor in Parkinson's disease: Protocol for a pilot study to assess reliability and clinical validation.
PLoS One
January 2025
Department of Sport, Exercise and Rehabilitation, Northumbria University, Newcastle upon Tyne, United Kingdom.
Ocular microtremor (OMT) is a fixational eye movement that cannot be seen with the naked eye but is always present, even when the eye appears motionless/still. The link between OMT and brain function provides a strong rationale for investigation as there lies potential for its use as a biomarker in populations with neurological impairments. OMT frequency is typically 70-80Hz in healthy adults and research suggests that this will be reduced in those with neurological disease such as Parkinson's Disease (PD).
View Article and Find Full Text PDFWhat can entropy metrics tell us about the characteristics of ocular fixation trajectories?
PLoS One
January 2024
Department of Computer Science, Texas State University, San Marcos, TX, United States of America.
In this study, we provide a detailed analysis of entropy measures calculated for fixation eye movement trajectories from the three different datasets. We employed six key metrics (Fuzzy, Increment, Sample, Gridded Distribution, Phase, and Spectral Entropies). We calculate these six metrics on three sets of fixations: (1) fixations from the GazeCom dataset, (2) fixations from what we refer to as the "Lund" dataset, and (3) fixations from our own research laboratory ("OK Lab" dataset).
View Article and Find Full Text PDFOcular microtremor: a structured review.
Exp Brain Res
September 2023
Department of Sport, Exercise and Rehabilitation, Northumbria University, Newcastle upon Tyne, UK.
Ocular microtremor (OMT) is the smallest of three involuntary fixational micro eye movements, which has led to it being under researched in comparison. The link between OMT and brain function generates a strong rationale for further study as there is potential for its use as a biomarker in populations with neurological injury and disease. This structured review focused on populations previously studied, instrumentation used for measurement, commonly reported OMT outcomes, and recommendations concerning protocol design and future studies.
View Article and Find Full Text PDFSuperior Oblique Myokymia: A Case Report of Surgical Treatment, Review of the Literature, and Consideration of Surgical Approach.
World Neurosurg
November 2019
Kikuna Yuda Ophthalmology Clinic, Yokohama, Kanagawa, Japan.
Background: Superior oblique myokymia (SOM) is a rare disorder characterized by episodic microtremor of the eyeball. in patients with SOM, intermittent contraction of the superior oblique muscle causes irregular and rotatory eye movement, causing oscillopsia and diplopia. Microvascular decompression (MVD) of the trochlear nerve is potentially a definitive treatment method for SOM; however, owing to its rarity, this disorder is not well-known to neurosurgeons, and thus the optimal surgical approach has not yet been determined.
View Article and Find Full Text PDFSimultaneous drift, microsaccades, and ocular microtremor measurement from a single noncontact far-field optical sensor.
J Biomed Opt
February 2015
University College Dublin, College of College of Engineering & Architecture, School of Electrical, Electronic and Communications Engineering, Communications and Optoelectronic Research Centre, SFI Strategic Research Cluster in Solar Energy Conversion, Bel.
We report on the combined far-field measurement of the three involuntary eye movements, drift, microsaccades, and ocular microtremor (OMT), using a noncontact far-field optical method. We review the significance of the smallest and least measured, and thus least understood, of the three, OMT. Using modern digital imaging techniques, we perform detailed analysis, present experimental results, and examine the extracted parameters using a noncontact far-field sensor.
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