Please use this identifier to cite or link to this item:
Title: Long-term effect of orthokeratology on the anterior segment length
Authors: Cheung, SW
Cho, P 
Keywords: Anterior chamber depth
Anterior segment length
Myopia control
Issue Date: 2016
Publisher: Elsevier
Source: Contact lens and anterior eye, 2016, v. 39, no. 4, p. 262-265 How to cite?
Journal: Contact lens and anterior eye 
Abstract: Purpose: To compare the effects of normal growth and longer term use of orthokeratology (ortho-k) on ocular biometric parameters in the anterior segment, including central corneal thickness (CCT), anterior chamber depth (ACD), crystalline lens thickness (CLT), and anterior segment length (ASL).
Methods: Baseline and six monthly data were retrieved from 78 subjects (aged 7-10 years, with myopia <= 4.00 D and astigmatism <= 1.25 D) who had completed a two-year randomized clinical trial using ortho-k for myopia control. They were randomly assigned to wear ortho-k lenses or single-vision spectacles (control). Anterior segment parameters were measured with the Pentacam after cycloplegia.
Results: No significant changes in CLT and ASL over time were observed in either group of subjects (37 ortho-k; 38 control). In the control group, CCT remained unchanged during the study period but in the ortho-k group, it was significantly reduced by an average of 0.009 mm by the 6-month visit (p < 0.001) and remained unchanged thereafter. No significant changes in ACD was found in the ortho-k group but it was significantly increased by an average of 0.04 mm (p = 0.001) in the control group.
Conclusion: CLT nor ASL did not change over time in either control or ortho-k subjects. Although ACD significantly increased in the control subjects and CCT significantly reduced in the first six months of ortho-k lens wear, these changes were small and did not affect the overall ASL.
ISSN: 1367-0484
EISSN: 1476-5411
DOI: 10.1016/j.clae.2016.02.003
Appears in Collections:Journal/Magazine Article

View full-text via PolyU eLinks SFX Query
Show full item record


Last Week
Last month
Citations as of Jul 8, 2018


Last Week
Last month
Citations as of Jul 15, 2018

Page view(s)

Last Week
Last month
Citations as of Jul 15, 2018

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.