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Evaluating internal and ocular residual astigmatism in Chinese myopic children

  • Clinical Investigation
  • Published:
Japanese Journal of Ophthalmology Aims and scope Submit manuscript

Abstract

Purpose

To investigate the nature of internal astigmatism (IA) and ocular residual astigmatism (ORA) in Chinese myopic children and to identify factors that may influence IA and ORA.

Methods

A total of 206 eyes of 206 myopic children (97 boys and 109 girls; 10.95 ± 2.2 years) were enrolled in this cross sectional study. Total ocular astigmatism (TOA), anterior corneal astigmatism (ACA), posterior corneal astigmatism (PCA) and total corneal astigmatism (TCA) were measured directly using either a Hartmann–Shack wavefront sensor or a Pentacam. IA and ORA were calculated by Fourier vector analyses (the definitions of IA and ORA are: IA = TOA − ACA − PCA, ORA = TOA − ACA). Spearman or Pearson correlation was adopted to detect multiple factors that may influence IA and ORA, which were then predicted by linear regressions. Modified compensation factors were applied to evaluate the inter-relationship between corneal astigmatism and ORA.

Results

While the mean values of IA and ORA were −0.52 DC × 94.8° and −0.63 DC × 93.0°, respectively, the percentage of ORA power over 1.00 D was as high as 28.64%. Full or under-compensation of ACA by ORA predominated in the enrolled subjects. The mean ORA J0 and J45 were −0.311 ± 0.236 and −0.032 ± 0.156 D, respectively, negatively correlated with the corresponding ACA components (J0: r = −0.276, J45: r = −0.616, p < 0.001). While age was not correlated with either IA or ORA (p > 0.1), the power of IA or ORA was correlated inversely with the axial length (IA: r = −0.193, p = 0.005; ORA: r = −0.169, p = 0.015) and positively with the spherical equivalent refraction (IA r = 0.195, p = 0.005; ORA r = 0.213, p = 0.002) and power of corneal astigmatism (IA-ACA: r = 0.302, IA-TCA: r = 0.368, ORA-ACA: r = 0.334, ORA-TCA: r = 0.293). Girls had larger IA powers than boys (0.741 ± 0.345 D vs 0.651 ± 0.340, p = 0.036).

Conclusions

Full or under-compensation of ACA by ORA is common in Chinese myopic children, and the compensation efficiency may decrease with age. Among Chinese children with myopia, a larger ORA is more prevalent with less myopia and greater corneal astigmatism.

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Acknowledgements

Thanks to Dr. Xi Wu and Dr. Yanling He for the design and technique support to the research. This research was supported by the Beijing Municipal Science & Technology Commission (No. Z131107002213127).

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Authors and Affiliations

  1. Department of Ophthalmology, Peking University People’s Hospital, Beijing, 100044, China

    Yanlin Liu, Yong Cheng, Lu Zhang, Mingwei Zhao & Kai Wang

  2. General Hospital of the Air Force, Beijing, 100142, China

    Yue Zhang

  3. Beijing Key Laboratory for the Diagnosis and Treatment of Retinal and Choroid Diseases, Beijing, 100044, China

    Yanlin Liu, Yong Cheng, Lu Zhang, Mingwei Zhao & Kai Wang

Authors
  1. Yanlin Liu
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  2. Yong Cheng
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  3. Yue Zhang
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  4. Lu Zhang
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  5. Mingwei Zhao
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  6. Kai Wang
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Corresponding author

Correspondence to Kai Wang.

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Y. Liu, None; Y. Cheng, None; Y. Zhang, None; L. Zhang, None; M. Zhao, None; K. Wang, None.

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Liu, Y., Cheng, Y., Zhang, Y. et al. Evaluating internal and ocular residual astigmatism in Chinese myopic children. Jpn J Ophthalmol 61, 494–504 (2017). https://doi.org/10.1007/s10384-017-0532-y

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  • DOI: https://doi.org/10.1007/s10384-017-0532-y

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