Body balance under ametropic conditions induced by spherical lenses in an upright position

Kim, Sangjin; Moon, Byeong-Yeon; Cho, Hyun Gug

doi:10.1589/jpts.27.615

Cited by 10 publications

(8 citation statements)

References 21 publications

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“…It is generally known that the visual system plays an essential role in balance control [ 30 ]. Moreover, several previous studies have indicated that experimentally induced myopia significantly worsens postural stability [ 31 , 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

Does Physical Activity Moderate the Relationship between Myopia and Functional Status in Children 9–11 Years of Age?

Modrzejewska

Domaradzki²,

Jedziniak³

et al. 2022

JCM

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Although previous studies have reported an association between physical activity (PA) and myopia in school-aged children, little is known about the link between myopia and children’s functional status. The purpose of this study was to investigate dynamic balance control in relation to the daily PA levels of myopic schoolchildren aged 9–11 years (n = 52) versus a non-myopic control group (n = 53). A single leg stance test performed on the instability platform of the Biodex Balance System was used to assess balance control. The overall stability index (OSI), anterior-posterior stability index (APSI) and medial-lateral stability index (MLSI) were analyzed. PA levels were calculated using the World Health Organization European Childhood Obesity Surveillance Initiative family record form. Myopes and non-myopes were separated into three subgroups based on PA level (low, moderate and high). Myopia significantly affected OSI (F = 40.46, p < 0.001), APSI (F = 33.93, p < 0.001) and MLSI (F = 49.51, p < 0.001). There were significant differences (p < 0.001) between myopic and non-myopic children with low and moderate levels of PA, whilst there were no differences between compared children with high levels of PA. High PA levels had a positive impact on balance control in myopes. Our results showed that PA levels moderate the relationship between myopia and children’s functional status.

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Section: Introductionmentioning

confidence: 99%

Does Physical Activity Moderate the Relationship between Myopia and Functional Status in Children 9–11 Years of Age?

Modrzejewska

Domaradzki²,

Jedziniak³

et al. 2022

JCM

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“…[4] 낙상의 위험요인으로는 연령증가, 보행 및 균형능력 저 하, 인지기능 감소, 심혈관질환 및 치매 등으로 다양하지 만, [5] 시각적 문제 또한 낙상의 위험을 증가시키는 주요원 인으로 대두되고 있다. 시각상태와 낙상위험에 관한 이전 연구를 살펴보면, Langley와 Mackintosh [6] 는 저시력자의 빈번한 낙상사고를 공간인지 및 사물인식능력의 저하가 균형유지능력을 감소시킨 결과로 설명하였고, De Boer 등 [7] 의 연구에서는 대비감도의 저하를, Nevitt 등 [8] [9,10] 또한, Glasauer 등 [11] 은 주시가 고정된 상태보다 추종안구운동이 발 생할 때 신체흔들림이 증가되는 것을 발견했고, Kim 등 [12] [16] 외안근 고유수용감각 신호(extra-ocular proprioceptive cues)는 공간과 신체간의 위치파악 뿐만 아니라 몸 전체의 자세를 조절하는데 필수적이고, [17,18] 융합성 이향운동의 신호 또한 고유수용감각의 정보를 포함하고 있어 정적자 세조절에 중요한 역할을 하는 것으로 알려져 있다. [19] Roll Bronstein [21] [25] 이러한 경우 시각정보 외 자세안정성을 조절하는 다른 관련감각기관(전정, 체성정보/소뇌정보처리)에서의 보상기전 또한 불완전해지게 된다.…”

Section: 서 론unclassified

The Influence of Binocular Single Vision Intervened Fusional Vergence and Diplopia on The Risk of Falling

Kim¹,

Oh²,

Su³

et al. 2017

KOOS

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This study was performed to investigate the influence of visual conditions such as binocular single vision intervened fusional vergence and diplopia on the risk of falls in static posture. Methods: Forty-two subjects of average age 23.40±2.70 years were participated in this study. In order to induce binocular single vision with fusional convergence (FC) and fusional divergence (FD), BI•BO prism lenses of 4Δ and 8Δ were added, respectively, and to induce vertical vergence (VV), OD-BU 1Δ/OS-BD 1Δ was added in a trial frame fully corrected subject's refractive error. We detected the minimum amount of prism that diplopia was occurred in each subject and applied for inducing diplopia in each direction of vergence. Using the TETRAX biofeedback system, the fall risk index (FI) was measured at each test condition and compared with that without prism effect. Also, the difference of FI depending on the amount of breakpoint in horizontal vergence was investigated. Results: FI was increased significantly when involved FC and VV for maintaining binocular single vision, but, FI decreased to the state without prism effect while diplopia is occurred. FI showed a higher tendency in the group with low BO break point. Conclusions: Even if binocular single vision was maintained, the visual state intervened FC and VV was analyzed as a factor that more increasing the risk of falling than the diplopia state.

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“…As mentioned above, although the types of refractive errors vary, most of the preceding studies are limited to conditions that cause myopic blur. In our own previously conducted studies, we analyzed the effects of refractive errors on hyperopia, astigmatism and inequality, as well as on postural stability and the risk of falling [23,24]. However, the results of our previous studies were obtained by experimentally incurring refractive errors using lenses which may be limited in their ability to determine the optical correction effect linked to wearing glasses.…”

Section: Introductionmentioning

confidence: 99%

Effect of optical correction by fully corrected glasses on postural stability

2020

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Although various previous studies have reported that the experimentally induced refractive errors interfered with postural control, few studies have demonstrated the optical correction effect of wearing glasses. The purpose of this study was to investigate whether wearing full corrected glasses to correct myopia and hyperopia can have a positive effect on postural stability. To this end, a total of 34 subjects (19 males and 15 females) of an average age of 22.38 ± 2.41-years-old participated in this study. After measuring the full corrected powers of refractive errors of subjects through subjective refraction, updated glasses were provided to 17 myopic subjects and first time glasses were provided to 17 hyperopic subjects as full corrected glasses, respectively. Postural evaluation was carried out using the TETRAX biofeedback system, after which we compared and analyzed the postural instability index and sway power index before and after wearing full corrected glasses. When updated and old glasses for correcting myopia were worn, the postural instability index was significantly reduced, and the sway power index was statistically decreased only in the mid-high frequency region associated with the somatic system, compared to the no glasses state, respectively. However, after wearing first time glasses for hyperopia correction, no significant difference was found in the postural instability index or sway power index. We suggest that providing optimal visual information through the optical correction of myopic refractive error is a useful approach that can lead to synergistic effects of somatic functions involved in postural control. Consequently, we demonstrated that wearing glasses to fully correct the refractive errors has a positive effect on increasing postural control in static posture. Our results may have important clinical implications in the field of optometry and balance evaluation.

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Body balance under ametropic conditions induced by spherical lenses in an upright position

Cited by 10 publications

References 21 publications

Does Physical Activity Moderate the Relationship between Myopia and Functional Status in Children 9–11 Years of Age?

Does Physical Activity Moderate the Relationship between Myopia and Functional Status in Children 9–11 Years of Age?

The Influence of Binocular Single Vision Intervened Fusional Vergence and Diplopia on The Risk of Falling

Effect of optical correction by fully corrected glasses on postural stability

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