KMID : 1159320200220020163
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Korean Journal of Vision Science 2020 Volume.22 No. 2 p.163 ~ p.171
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Impact of Fixation Direction on Dynamic Accommodative Response
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Kim Jae-Eun
Park Ye-Hyeon Jo Ha-Won Park Inn-Jee Park Hyung-Min Chu Byoung-Sun
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Abstract
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Purpose : The purpose of this study was to measure accommodative response when looking at different direction such as downgaze and sidegaze either right or left.
Methods : This study was performed with 13 adult males and females(22.40¡¾0.41 years old) no subject had ophthalmic surgery or disease and placed the targets at the primary, 10¡Æ and 20¡Æ sidegaze, 10¡Æ and 20¡Æ downgaze, The accommodative responses was measured by a open-field autorefractometer under the distances of 3 m, 1 m and 40 cm that enable consecutive measurement.
Results : In all gaze directions as distance became shorter the accommodative response increased. At each viewing distance 1m and 40 cm, the accommodative responses showed the peaks 1.09¡¾0.10 D in 10¡Æ and 2.04¡¾0.11 D in 20¡Æ downgaze. respectively, while the lowest accommodative responses were 0.44¡¾0.05 D and 1.54¡¾0.06 D in 20¡Æ and 10¡Æ sidegaze, which showed statistical differences(p£¼0.050). There were significant differences in each viewing direction except for in 10¡Æ and 20¡Æ sidegaze(p£¼0.050). The gaze direction and the accommodative responses were significantly different(p£¼0.050).
Conclusion : This study demonstrates that the accommodative responses vary with the gaze direction and gaze angle for the same modulating stimulus. Therefore, it is assumed that 20¡Æ downgaze makes the object sharper and minimizes the eye fatigue.
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KEYWORD
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Accommodation, Accommodative responses, Gaze direction
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