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Japanese Journal of Ophthalmology
Published in: Japanese Journal of Ophthalmology 3/2018

01-05-2018 | Clinical Investigation

Astigmatism in Chinese primary school children: prevalence, change, and effect on myopic shift

Authors: Shao-En Chan, Hsi-Kung Kuo, Chia-Ling Tsai, Pei-Chang Wu

Published in: Japanese Journal of Ophthalmology | Issue 3/2018

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Abstract

Purpose

To study the prevalence, type, and progression of astigmatism in primary school children, and its effect on myopic shift.

Study design

A prospective study carried out in a primary school in southern Taiwan.

Methods

The study was performed on a subset of children, one year after initial examination. Refractive error measured by cycloplegic autorefraction was the main study outcome. Astigmatism was recorded as negative cylinder form, and we defined clinical significant astigmatism (CSA) as cylinder refraction -1.0 D or greater. Myopia was defined as a spherical equivalent refraction (SER) of -0.50 D or greater.

Results

Three hundred sixty-two children, mean age was 8.97 y/o (SD 1.41; range 7 to 11 y/o) participated in the study. One hundred nineteen (32.9 %) subjects had CSA at the initial screening. The mean cylinder refraction was -0.80 + 0.84 diopters (D) (-5.25 D to 0.00 D), with predominant with rule astigmatism (69.7%). In the 183 children studied longitudinally, the mean cylinder refraction was reduced from -0.74 D to -0.58 D (p< 0.05). The cylinder refraction in the initial CSA group was not associated with SER change (p=0.99) or axial length change (p=0.55). Compared to the initial non-CSA group, the initial CSA group had no significant difference in axial length elongation (p=0.20).

Conclusion

The prevalence of astigmatism was not low in the Chinese primary school children and with-the-rule astigmatism was predominant. The astigmatism decreased during the 1 year follow-up. The CSA was not associated with myopia progression (p=0.99).
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Metadata
Title
Astigmatism in Chinese primary school children: prevalence, change, and effect on myopic shift
Authors
Shao-En Chan
Hsi-Kung Kuo
Chia-Ling Tsai
Pei-Chang Wu
Publication date
01-05-2018
Publisher
Springer Japan
Published in
Japanese Journal of Ophthalmology / Issue 3/2018
Print ISSN: 0021-5155
Electronic ISSN: 1613-2246
DOI
https://doi.org/10.1007/s10384-018-0580-y

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