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.
Keywords
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References
- The Longitudinal Orthokeratology Research In Children (LORIC) in Hong Kong: A pilot study on refractive changes and myopic control.Curr. Eye Res. 2005; 30: 71-80
- Corneal reshaping and myopia progression.Br. J. Ophthalmol. 2009; 93: 1181-1185
- Myopia control with orthokeratology contact lenses in Spain: refractive and biometric changes.Invest. Ophthalmol. Vis. Sci. 2012; 53: 5060-5065
- Influence of overnight orthokeratology on axial elongation in childhood myopia.Invest. Ophthalmol. Vis. Sci. 2011; 52: 2170-2174
- Long-term effect of overnight orthokeratology on axial length elongation in childhood myopia: a 5-year follow-up study.Invest. Ophthalmol. Vis. Sci. 2012; 53: 3913-3919
- Retardation of myopia in orthokeratology (ROMIO) study: a randomized controlled trial.Invest. Opthalmol. Vis. Sci. 2012; 53: 7077-7085
- Myopic control using toric orthokeratology (TO-SEE study).Invest. Opthalmol. Vis. Sci. 2013; 54: 6510-6517
- High myopia – partial reduction orthokeratology (HM-PRO) study: a 2-year randomised clinical trial.Optom. Vis. Sci. 2013; 90: 530-539
- The visual status of children ages 3 to 6 years in the vision screening program in Taiwan.J. AAPOS. 2009; 13: 58-62
- Prevalence of refractive error in Singaporean Chinese children: the strabismus amblyopia, and refractive error in young Singaporean Children (STARS) study.Invest. Ophthalmol. Vis. Sci. 2010; 51: 1348-1355
- Prevalence of myopia among Hong Kong Chinese schoolchildren: changes over two decades.Ophthalmic Physiol. Opt. 2012; 32: 17-24
- Risk factors of myopic shift among primary school children in beijing: China: a prospective study.Int. J. Med. Sci. 2015; 12: 633-638
- Parents' knowledge and perspective of optical methods for myopia control in children.Optom. Vis. Sci. 2014; 91: 634-641
- Corneal response to short-term orthokeratology lens wear.Optom. Vis. Sci. 2003; 80: 200-206
- Safety and efficacy of overnight orthokeratology in myopic children.Optometry. 2007; 78: 225-231
- Orthokeratology practice in children in a university clinic in Hong Kong.Clin. Exp. Optom. 2008; 91: 453-460
- Myopia stabilization and associated factors among participants in the Correction of Myopia Evaluation Trial (COMET).Invest. Ophthalmol. Vis. Sci. 2013; 54: 7871-7884
- Efron Grading Scales for Contact Lens Complications.
Article info
Publication history
Published online: December 27, 2016
Accepted:
December 1,
2016
Received in revised form:
November 16,
2016
Received:
August 19,
2016
Identification
Copyright
© 2016 British Contact Lens Association. Published by Elsevier Ltd. All rights reserved.
