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KMID : 1011420230280010019
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Journal of Korean Ophthalmic Optics Society
2023 Volume.28 No. 1 p.19 ~ p.26
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Changes in Falling Risk of Intermittent Exotropia after Vision Therapy
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Kim Ryun-Young
Cho Hyun-Gug
Yu Dong-Sik
Kim Sang-Yeob
Moon Byeong-Yeon
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Abstract
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Purpose : To investigate the changes in visual functions and the fall risk index after vision therapy for intermittent exotropia.
Methods : Twenty-nine subjects, diagnosed with intermittent exotropia, were subjected to vision therapy for 50 minutes once a week for 6 months. The changes in visual functions and body sway before and after training were measured. Visual therapy involved accommodation training and fusional vergence training. As for visual functions, distance corrected visual acuity, the amount of deviation, positive convergence vergence, and stereopsis were measured. Fall risk assessment was performed using the BTrackSTM balance measuring device and was calculated based on the change in sway path length at the center of body pressure.
Results : After 6 months of vision therapy, distance logMAR corrected visual acuity improved from 0.02±0.11 to -0.04±0.08 (p<0.001), and the amount of deviation decreased from -24.69±11.37 △ to -12.56±7.11 △ (p<0.001). The break point of positive fusion vergence increased from 3.66±4.97 △ to 32.10±13.52 △, and the recovery point increased from 2.10±3.57 △ to 26.45±11.69 △ (p<0.001). Stereopsis decreased from 219.66±264.35 sec to 101.03±194.83 sec (p<0.05). After vision therapy, the body sway path changed from 41.00±15.20 cm to 33.52±12.26 cm, which indicated a reduced risk of falling (p<0.001). Based on the results of our correlation analysis improvement following corrected visual acuity was correlated with a reduction in body sway (dominant eye: r=0.366, p=0.005/non-dominant eye: r=-0.356, p=0.006).
Conclusions : Vision therapy applied to patients with intermittent exotropia can reduce the risk of falls due to improved corrected visual acuity.
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KEYWORD
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Vision therapy, Fall risk, Intermittent exotropia, Body sway, Visual acuity
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