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KMID : 1011420140190020239
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Journal of Korean Ophthalmic Optics Society
2014 Volume.19 No. 2 p.239 ~ p.246
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Changes of Body Balance on Static Posture According to Types of Induced Ametropia
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Kim Sang-Yeob
Moon Byeong-Yeon
Cho Hyun-Gug
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Abstract
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Purpose: This study was performed to investigate the effect of induced ametropia on static posture for body balance.
Methods: Twenty subjects (10 males, 10 females) of average age 23.4±2.70 years were participated and ametropia(binocular myopia; BM, simple myopic anisometropia; SMA, binocular hyperopia; BH, and simple hyperopic anisometropia; SHA) were induced with ±0.50 D, ±1.00 D, ±1.50 D, ±2.00 D, ±3.00 D, ±4.00 D, ±5.00 D, respectively. General stability (ST), weight distribution index (WDI), and fall risk index (FI) were measured using TETRAX the biofeedback systems. Each index of the body balance was evaluated for 32 seconds in each ametropic condition and those value was compared with the value in fully corrected condition.
Results:
The ST showed significant increase from +0.50 D under condition of BM, from +1.00 D under condition of SMA, from ?1.00 D under condition of BH, and from ?1.50 D under condition of SHA compared with under condition of fully corrected condition, respectively. The FI showed significant increases from +4.00 D under condition of BM, from ?1.00 D under condition of BH, and from ?1.50 D under condition of SHA. The WDI
show no change in all ametropia condition.
Conclusions: Whatever ametropia is, uncorrected refractive error could reduce the general stability of body balance and increase the falling risk.
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KEYWORD
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Ametropia, Body balance, General stability, Fall risk index
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