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Identifier 000414984
Title Αξιολόγηση ενός χαμηλού κόστους, ασύρματου συστήματος ηλεκτρομυογραφίας στη μέτρηση του θάμβους όχλησης
Alternative Title Evaluation of a low -cost wireless electromyography system to the measurement of discomfort glare
Author Μαρκάκης, Γεώργιος
Thesis advisor Πλαϊνης, Σωτήρης
Τσιλιμπάρης, Μιλτιάδης
Χατζάκης, Πέτρος
Reviewer Παπάζογλου, Δημήτριος
Σιγανός, Χαράλαμπος
Abstract Purpose Contrary to the subjective De Boer rating scale that is widely used for the evaluation of discomfort glare and is non calibrated, influenced by various parameters and carries a degree of uncertainty, the electromyography (EMG) of the muscles surrounding the eye has been proposed as an objective method for measuring discomfort glare. A major disadvantage of this method is the high cost of the equipment and the necessity of being used in a laboratory environment. Bitalino, a biosignals toolkit, can surpass all these problems, as it is low cost, portable and can be used in any environment. The purpose of this study is to evaluate Bitalino’s effectiveness on measuring ocular EMG signals and consequently discomfort glare. Methods A group of 11 patients with no ophthalmic pathology and best corrected participated in the study. Ocular EMG signals were measured with the Bitalino toolkit at one eye and with a desktop neurophysiological amplifier (CED 1902) at the other eye. A glare source (100W halogen lamp) was placed in front of the subject at 50 cm distance. Measurements were made in five illumination conditions: 0, 500, 2000, 3000, 6000 lux of vertical illuminance at eye level. Each measurement lasted 4 seconds with 2 minutes dark adaptation time in between. The signal to noise ratio was extracted for the area under frequencies from 180-220 Hz, in the frequency domain, as an index for discomfort glare. Results and conclusion The calculated discomfort glare index for 11 patients and the five lighting conditions as measured with the Bitalino toolkit was correlated with that measured with the CED 1902 amplifier (r=0.75, p<0.001). The Bitalino toolkit may not have the resolution and sensitivity of a high grade neurophysiological system, but can be potentially used for a rough evaluation of discomfort glare, with the advantages of portability and low cost.
Language Greek
Subject Ηλεκτρομυογράφημα
Θάμβος όχλησης
Issue date 2018-03-28
Collection   School/Department--School of Medicine--Department of Medicine--Post-graduate theses
  Type of Work--Post-graduate theses
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