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The velocity of saccadic eye movements by using eye-gaze tracking system

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  • 視線追跡装置による衝動性眼球運動速度の計測

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[Purpose] To measure the velocity of saccadic eye movements (SEMs) in healthy people by using an eye-gaze tracking system.<br>[Participants] Thirty-three healthy individuals aged 20 years or more with a corrected visual acuity of 1.0 or better were included. They had no abnormal eye positions or movements, or pupil abnormality.<br>[Methods] A chart, based on the Hess red-green test, was shown on a liquid crystal display (LCD) screen. Dots were displayed at positions of 15 degrees in the horizontal and vertical direction, and 21 degrees in the diagonal direction from the center. First, the subject was instructed to fixate on the center and then, move the eyes to another displayed dot. The ViewPoint EyeTracker® System (Arrington Research, USA) equipped with a high-resolution eye camera (220_Hz) traced the movements of the pupil center and recorded its position in the x-y plane. The mean and maximum velocities of SEMs (degree/sec) were measured using the data obtained.<br>[Results] The mean velocity of SEMs in each direction was as follows: supraversion, 180.0±26.8 (mean±SD) deg/sec; infraversion, 177.3±42.9; dextroversion, 217.3±25.0; levoversion, 214.7±25.0; dextro-supraversion, 219.5±28.0; dextro-infraversion, 216.0±45.7; levo-supraversion, 231.2±39.7; levo-infraversion, 212.2±47.9. Vertical gaze velocities were significantly lower than horizontal and diagonal gaze velocities (p<0.05).<br>[Conclusion] Velocities of SEMs in healthy individuals were measured. The SEMs differed depending on the direction of eye movement. Especially, the velocities in the vertical direction were lower than those in the other directions.



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