Discontinuation of orthokeratology on eyeball elongation (DOEE). Issue 2 (April 2017)

• Record Type: Journal Article
• Authors: Cho, P.; Cheung, S.W.
• Is Part Of: Contact lens & anterior eye. Volume 40:Issue 2(2017)
• Page Start: 82
• Page End: 87
• Publication Date: 2017-04
• Subjects: Orthokeratology -- Myopia control -- Discontinuation -- Axial elongation; Anterior segment (Eye) -- Periodicals; Contact lenses -- Periodicals; Segment antérieur (Œil) -- Périodiques; Lentilles de contact -- Périodiques; 617.752305
• DOI: 10.1016/j.clae.2016.12.002
• Languages: English
• ISSNs: 1367-0484

Abstract

Highlights: Stopping ortho-k lens wear at or before the age of 14 years led to a more rapid, axial elongation, comparable to those wearing spectacles during the initial 2-year myopia control study. Resuming lens wear after ceasing ortho-k lens wear for six months led to significantly slower axial elongation. 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 ortho-k 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 OKc 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.