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KMID : 0360220180590111009
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Journal of the Korean Ophthalmological Society
2018 Volume.59 No. 11 p.1009 ~ p.1016
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Comparative Effect of Spectacles and Orthokeratology Lenses on Axial Elongation in Children with Mild?to?Moderate Myopia
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Kim Tae-Hee
Kim Myung-Hun
Kwag Joo-Young
Choi Jin-Seok
Pak Kyu-Hong
Lee Kyeong-Wook
Park Tae-Seong
Chung Sung-Kun
Hyun Joo
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Abstract
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Purpose: To assess the effect on axial elongation and associated factors between spectacles and of orthokeratology lens (OK) wearing in children with mild to moderate myopia.
Methods: A total of one hundred subjects, ranging in age from 6 to 13 years, and with mild to moderate myopia no more than -4.50 diopters in spherical equivalent, visited our clinic from 2013 to 2015. The OK group (75 eyes) and the spectacles group (64 eyes) were compared and analyzed on the axial elongation and associated factors.
Results: In the OK group, axial length was elongated in 1 year period with a mean increase of 0.24 ± 0.29 mm. In spectacles group, axial length was elongated in 1 year period with a mean increase of 0.42 ± 0.20 mm. The statistically significant suppression of axial elongation was observed in OK group compared to the spectacles group (Mann-Whitney U test, p < 0.05). For OK group, the age of starting OK (Pearson's correlation, r = -0.481, p < 0.05) was the only influencing factor on axial elongation, which had negative correlation with axial elongation. In spectacles group, the age of starting spectacles had negative correlation with axial elongation (Pearson's correlation, r = -0.462, p < 0.05) and baseline spherical equivalent, spherical diopter, cylindrical diopter from manifest refraction had positive correlation with axial elongation. Comparison of axial elongation in orthokeratology lens group and spectacles group by age groups (6 to 9 years [28 eyes], 9 to 13 years [47 eyes]), 9 to 13 years of orthokeratology lens group had the stronger suppression of axial elongation (Mann-Whitney U test, p < 0.05).
Conclusions: The OK effectively suppresses axial elongation compared to the spectacles. Although the patients are in age from 9 to 13 years, the axial elongation was effectively suppressed.
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KEYWORD
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Axial elongation, Myopia, Orthokeratology lens
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