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KMID : 1011420230280030209
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Journal of Korean Ophthalmic Optics Society
2023 Volume.28 No. 3 p.209 ~ p.216
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Clinical Application of Eye Tracker in Pursuit Eye Movements
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Moon Byeong-Yeon
Cho Hyun-Gug
Kim Sang-Yeob
Yu Dong-Sik
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Abstract
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Purpose : This study evaluated the feasibility of clinical application of an eye tracker in pursuit eye movements test.
Methods : Twenty-five subjects (mean age, 21.04±1.67 years) with normal phoria were included. Pursuit eye movements in horizontal, vertical, and diagonal directions using the Clinical Eye Tracker were measured, and analyzed by calculating bivariate contour ellipse area (BCEA) and standard deviation (SD) area. Pursuit eye movements were evaluated based on 40 deg(°) of the range of the moving target.
Results : Pursuit eye movements were from 58.42 deg2 for the vertical direction to 100.60 deg2 for the left diagonal direction in the evaluation by the BCEA, and from 42.45 deg2 for the horizontal direction to 81.57 deg2 for the left diagonal direction by the SD area. In the relative comparison, the evaluation by the BCEA and SD area showed overestimation and underestimation, respectively. The Spearman’s correlation coefficients between BCEAs and SD areas ranged from 0.665 for the left diagonal direction to 0.993 for the vertical direction. In both evaluations, the horizontal and vertical directions were more stable and accurate than diagonal directions.
Conclusions : This study demonstrated the feasibility of evaluating pursuit eye movements based on the BCEA and SD area in several directions using the eye tracker for subjects with normal phoria.
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KEYWORD
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Pursuit eye movement, Eye tracker, Bivariate contour ellipse area (BCEA), Standard deviation area, Phoria
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