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BioMed Research International
Volume 2015 (2015), Article ID 278425, 7 pages
http://dx.doi.org/10.1155/2015/278425
Research Article

Short-Term Changes in Light Distortion in Orthokeratology Subjects

1Private Practice, Onda, 12200 Castellon, Spain
2Optometry Research Group, Department of Optics, Universidad de Valencia, 46100 Valencia, Spain
3Clinical & Experimental Optometry Research Lab (CEORLab), Center of Physics (Optometry), Universidade do Minho, 4710-057 Braga, Portugal
4Department of Optics and Optometry, Universidad Europea de Madrid, 28670 Villaviciosa de Odón, Spain

Received 21 June 2014; Revised 17 November 2014; Accepted 1 December 2014

Academic Editor: Terri L. Young

Copyright © 2015 Elena Santolaria Sanz 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. Quantifying adaptation to light distortion of subjects undergoing orthokeratology (OK) for myopia during the first month of treatment. Methods. Twenty-nine healthy volunteers (age: 22.34 ± 8.08 years) with mean spherical equivalent refractive error −2.10 ± 0.93D were evaluated at baseline and days 1, 7, 15, and 30 of OK treatment. Light distortion was determined using an experimental prototype. Corneal aberrations were derived from corneal topography for different pupil sizes. Contrast sensitivity function (CSF) was analyzed for frequencies of 1.50, 2.12, 3.00, 4.24, 6.00, 8.49, 12.00, 16.97, and 24.00 cpd under photopic conditions. Results. Average monocular values of all light distortion parameters measured increased significantly on day 1, returning to baseline after 1 week ( in all cases). Spherical-like aberration stabilized on day 7 for all pupil diameters, while coma-like for smaller pupils only. CSF was significantly reduced on day 1 for all spatial frequencies except for 1.5 cpd, returning to baseline afterwards. Significant correlation was found between light distortion and contrast sensitivity for middle and high frequencies () after 15 days. Conclusion. Despite consistently increased levels of corneal aberrations, light distortion tends to return to baseline after one week of treatment, suggesting that neural adaptation is capable of overcoming optical quality degradation.