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Title: Discontinuation of orthokeratology on eyeball elongation (DOEE)
Authors: Cho, P 
Cheung, SW 
Keywords: Orthokeratology
Myopia control
Axial elongation
Issue Date: 2017
Publisher: Elsevier
Source: Contact lens and anterior eye, 2017, v. 40, no. 2, p. 82-87 How to cite?
Journal: Contact lens and anterior eye 
Abstract: Purpose: To evaluate and compare changes in axial elongation, over a 14-month period, in subjects who discontinued and then resumed ortho-k lens wear with those who continued to wear their lenses or spectacles following a 2-year myopia control study.
Method: This single masked, prospective study recruited subjects who had just completed a 2-year myopia control study. Ortho-k subjects were classified as Group OKc, in which subjects continued orthok lens wear for the duration of the study; or Group OKd in which subjects discontinued lens wear for seven months and wore single-vision spectacles (Phase I) and then resumed ortho-k lens wear for another seven months (Phase II). Spectacle-wearing control subjects from the initial myopia control study continued wearing spectacles as control subjects. Axial lengths were measured at scheduled visits using the IOLMaster.
Results: Thirteen, 16, and 15 Control, OKc, and OKd subjects, aged 8-14 years, respectively completed the study. Significant increase in axial elongation was found in OKd subjects only in Phase I but not in Phase II. On resuming lens wear, in Phase II, the rate of axial elongation was no longer significantly different from those of the Control or 0Kc subjects.
Conclusion: Stopping ortho-k lens wear at or before the age of 14 years led to a more rapid increase in axial length; comparable to those wearing spectacles during the initial 2-year myopia control study, but greater than the Control and OKc group in this study. Axial elongation slowed again with resumed lens wear after six months.
ISSN: 1367-0484
EISSN: 1476-5411
DOI: 10.1016/j.clae.2016.12.002
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