Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/62299
Title: Long-term effect of orthokeratology on the anterior segment length
Authors: Cheung, SW
Cho, P 
Keywords: Anterior chamber depth
Anterior segment length
Orthokeratology
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.
URI: http://hdl.handle.net/10397/62299
ISSN: 1367-0484
EISSN: 1476-5411
DOI: 10.1016/j.clae.2016.02.003
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