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Journal of Ophthalmology
Volume 2017 (2017), Article ID 3279821, 6 pages
https://doi.org/10.1155/2017/3279821
Research Article

Influence of Overnight Orthokeratology on Corneal Surface Shape and Optical Quality

Department of Ophthalmology, The Second Hospital of Dalian Medical University, Dalian, Liaoning 116027, China

Correspondence should be addressed to Qi Zhao

Received 2 June 2017; Revised 6 September 2017; Accepted 14 September 2017; Published 1 October 2017

Academic Editor: Jesús Pintor

Copyright © 2017 Yuan Sun 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

Purpose. To investigate the changes of corneal surface shape and optical quality during orthokeratology. Methods. 49 eyes of 26 patients (10.63 ± 2.02 years old) who underwent overnight orthokeratology for myopia were prospectively examined. The corneal surface shape parameters, including surface regularity index (SRI) and surface asymmetry index (SAI), were attained with an OPD-III SCAN. The higher-order aberrations and higher-order Strehl ratios were calculated under a 3 mm pupil diameter before orthokeratology, 1 month, 3 months, and 6 months after orthokeratology. A value of less than 0.05 was statistically significant. Results. Months after orthokeratology, SRI and SAI were both showing a significant increase in comparison with those before orthokeratology (). After orthokeratology, for a 3 mm pupil, the higher-order Strehl ratio presented a reduction of 0.217 μm (), and the higher-order aberration root mean square (HOA RMS) showed a mean increase of 0.100 μm (). There were significant increases in spherical aberration () and coma () after orthokeratology. Trefoil showed a slight reduction at month 6 after orthokeratology, but there was no statistical significance (). Conclusion. Overnight orthokeratology for a correction of myopia resulted in a significant improvement in refractive error but increased corneal irregularity and ocular higher-order aberrations, especially in spherical aberration.