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KMID : 1011420230280010009
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Journal of Korean Ophthalmic Optics Society
2023 Volume.28 No. 1 p.9 ~ p.17
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Comparative Analysis of Fixation Stability before and after Blinking during Binocular Viewing
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Kim Sang-Yeob
Moon Byeong-Yeon
Cho Hyun-Gug
Yu Dong-Sik
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Abstract
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Purpose : This study aimed to analyze differences in the fixation stability and gaze positions before and after blinking during binocular viewing.
Methods : Of the 40 subjects (21.53±2.06 years) without ocular disease and currently not taking any medications, 28 and 12 subjects were classified into abnormal and normal phoria groups, respectively. Data recorded for 10 s using an eye tracker during fixation were analyzed for fixation stability, gaze positions, and changes in gaze positions for the two groups.
Results : In both the abnormal and normal phoria groups, the fixation stability was more stable before than after blinking, but there was no significant difference between the two groups. The gaze positions showed differences before and after blinking in the horizontal direction, but the horizontal gaze positions were more accurate than the vertical gaze positions. In addition, changes in gaze positions over a short time tended to increase slightly in the vertical gaze position after blinking in the normal phoria group.
Conclusions : Fixation stability during binocular viewing was stable until blinking but became unstable immediately after blinking. It is, therefore, likely that fixation stability is unstable as a result of blinking, whereas the horizontal gaze positions may be stabilized by micro-movements until blinking occurs.
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KEYWORD
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Fixation stability, Phoria, Blinking, Gaze position, Eye tracker
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