The Effect of Treatment Zone Decentration on Myopic Progression during Or-thokeratology. (3rd May 2020)

• Record Type: Journal Article
• Authors: Chen, Ruru; Chen, Yan; Lipson, Michael; Kang, Pauline; Lian, Hengli; Zhao, Yune; McAlinden, Colm; Huang, Jinhai
• Is Part Of: Current eye research. Volume 45:Number 5(2020)
• Page Start: 645
• Page End: 651
• Publication Date: 2020-05-03
• Subjects: Orthokeratology -- myopic children -- zone decentration -- axial growth; Ophthalmology -- Periodicals; Eye -- Diseases -- Periodicals; Ophthalmology -- Periodicals; 573.88
• DOI: 10.1080/02713683.2019.1673438
• Languages: English
• ISSNs: 0271-3683

Abstract

ABSTRACT: Purpose : To evaluate the relationship between magnitude of orthokeratology (OrthoK) treatment zone decentration and 2-year axial length (AL) elongation in myopic children. Methods : One-hundred and one Chinese children who wore OrthoK contact lenses for 2 years. The magnitude and direction of the OrthoK treatment zone center from the entrance pupil center were recorded after 3 and 24 months of lens wear along with AL measurement. Stepwise multiple linear regression analysis was performed to assess which factors significantly affected an increase in AL. Results : After 3 and 24 months of OrthoK treatment, the mean (± standard deviation [SD]) magnitude of the OrthoK treatment zone decentration was 0.64 ± 0.38 mm and 0.68 ± 0.32 mm, respectively. There were no significant differences between the two time points ( P > .05). After 2 years of OrthoK contact lenses wear, the mean (± SD) AL growth was 0.36 ± 0.34 mm. The axial elongation was slightly correlated with baseline age of subjects (r = −0.073, P < .001), baseline spherical equivalent refractive error (r = −0.088, P < .001) and magnitude decentration of treatment zone (r = −0.190, P = .027). Conclusions : The decentration of OrthoK treatment zone stabilizes after 3 months of lens wear and slightly decreases AL growth.