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Journal of Ophthalmology
Volume 2018, Article ID 2043718, 8 pages
Research Article

Reliability of Ocular Aberration Measurements in Children with Moderate and Low Myopia under Scotopic Conditions

1State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China
2Aier School of Ophthalmology, Central South University, Changsha, Hunan Province, China

Correspondence should be addressed to Weizhong Lan; moc.931@54885452731 and Xiao Yang; moc.361@coz_xgnay

Received 31 July 2017; Revised 19 November 2017; Accepted 30 November 2017; Published 11 February 2018

Academic Editor: Tamer A. Macky

Copyright © 2018 Zhouyue Li 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.


Purpose. To investigate the reliability of ocular aberration measurement in myopic children under scotopic conditions and to validate the mathematical Zernike pupil scaling-down technique. Methods. Ocular aberrations of 45 myopic children were examined under scotopic conditions via iTrace aberrometer. The intra- and intersession repeatability was evaluated for both the measured values with the true pupil sizes and the estimated ones that were determined by scaling down the pupil sizes to the largest integer value across all measurements. Results. The intra- and intersession difference of clinically measured aberration was generally insignificant, and the ICCs for each aberration component exhibited good to excellent reliability (ICCs > 0.4). Similar results were found for the estimated aberration using the scaling-down technique. Although the majority of the estimated Zernike components were comparable with the corresponding measured one, the estimated values of defocus, coma, and the corresponding total aberrations were found significantly smaller than the measured values (all ). Conclusions. The ocular aberration measurements in myopic children under the circumstances described are reliable. The scaling-down technique is a useful option for comparing the results obtained from different pupil sizes, but the estimated Zernike coefficients were not always comparable with the corresponding measured values.