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KMID : 1011420180230020135
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Journal of Korean Ophthalmic Optics Society
2018 Volume.23 No. 2 p.135 ~ p.141
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Application of Eye Tracker for Assessing Saccadic Eye Movements
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Yu Dong-Sik
Cho Hyun-Gug
Kim Sang-Yeob
Moon Byeong-Yeon
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Abstract
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Purpose: This study aimed to find out whether the eye tracker was an applicable tool for a clinical saccadic eye movement test.
Methods: Thirty-eight subjects (mean age: 20.61±1.00 years) were recruited. All subjects underwent history taking, visual acuity test with or without correction, gross saccade test, and prism cover test. Horizontal and vertical saccades were measured with Clinical Eye Tracker in visual angle of 30 deg at a distance of 55 cm. Quantification of horizontal and vertical saccades were categorized into components such as size (length and width), and speed for further analysis.
Results: Components were not significantly different between horizontal and vertical saccades. The fixation length of horizontal saccade reduced with the decrease in exophoria or the increase in esophoria at a near distance (r = ?0.438, p = 0.006). The speed of vertical saccade was faster with the increase in esophoria, and slower with the increase in exophoria (r = 0.322, p = 0.049). Normal group tended to be nearer to visual angle in the saccade size, and faster in the saccade speed than potential abnormal group. Normal group tended to be nearer (to visual angle) in the saccade size, and faster in the saccade speed than potential normal (not completely normal) group.
Conclusions: The size and speed of saccade in a given visual angle could be assessed objectively using the eye tracker. This study shows that an eye tracker is an applicable alternative tool for a clinical saccadic eye movement test.
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KEYWORD
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Horizontal saccade, Vertical saccade, Eye tracker, Eye movement
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