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Journal of Ophthalmology
Volume 2018, Article ID 1686045, 5 pages
https://doi.org/10.1155/2018/1686045
Research Article

Internal Astigmatism and Its Role in the Growth of Axial Length in School-Age Children

1Department of Ophthalmology, Jing’an District Centre Hospital of Shanghai, Fudan University, Shanghai, China
2Department of Ophthalmology and Vision Science, Eye and ENT Hospital, Shanghai Medical College, Fudan University, Shanghai, China

Correspondence should be addressed to Xingtao Zhou; moc.361@uohzoatgnix

Received 10 September 2017; Revised 12 December 2017; Accepted 24 December 2017; Published 18 April 2018

Academic Editor: Ewa Mrukwa-Kominek

Copyright © 2018 Liangcheng Wu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objectives. To explore the role of internal astigmatism (IA) in the growth of axial length (AL) in school-age children. Methods. Total astigmatism (TA), corneal astigmatism (CA), and AL of all children in Jing’an District 2nd Centre Primary School in Shanghai were measured. In IA, the difference between TA and CA was also calculated using vector analysis. The association of axial length with IA, genders, and age was analyzed using linear regression. The difference of IA between both eyes was also calculated. The AL between both eyes was compared using paired samples t-test when DIA = 0 D, <0.5 D, and ≥0.5 D. Results. Six hundred and twelve cases (98.23%) in 623 children aged 7–12 yrs older entered into the study. Genders, age, and IA all affected AL. This could be represented by a linear regression line in the form AL = 21.46 − 0.43gender + 0.22age + 0.46IA (male = 1, female = 2; , for sex; , for age; and , for IA; ). The AL in the eye with larger IA was also longer when DIA was larger than 0.5 D (, ). Conclusions. IA was observed to be associated with AL and might be a risk factor of the onset and progress of myopia in school-age children.