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KMID : 1159320190210020193
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Korean Journal of Vision Science
2019 Volume.21 No. 2 p.193 ~ p.200
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Comparison of Axial Length between Morning and Afternoon in Children
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Kim Hyo-Jin
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Abstract
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Purpose : The aim of this study was to investigate distribution and difference in the axial length (AL) according to the time of measurement in elementary school children.
Methods : A cross-sectional study was conducted on 34 eyes of 34 children aged 12 to 13 years (mean age: 12.4±0.3 years; boys and girls: 17 and 17) residing in Seoul. The AL was measured by using partial coherence interferometry, and the refractive error was measured by using an open-field autorefractor. Two sets of measurements were collected at 4-hour intervals, with the first measurement taken at 9 AM and the second at 1 PM.
Results : The AL did not vary significantly in accordance with sex (AM: boys, 24.24±1.19 mm; girls, 24.04±0.94 mm, p=0.578, PM: boys 24.29±1.13 mm, girls 24.18±0.85 mm, p=0.750). A positive correlation was found between the AL measured in the AM and the AL measured in the PM r2=0.949, p<0.001, y=0.876x+3.058, p<0.001). The ALs were observed between 9 AM(24.18±1.08 mm) and 1 PM (24.25±1.00 mm) (p=0.709). However, the difference in the AL was 0.07±0.34 mm which was not significant difference.
Conclusion : Although the AL was generally longer in the PM than in the AM, no significant difference was observed in the AL between the measuring times.
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KEYWORD
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Axial length, Children, Myopia, Partial coherence interferometry
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