Long-term effect of orthokeratology on the anterior segment length

Sin Wan Cheung, Hie Hua Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

37 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)262-265
Number of pages4
JournalContact Lens and Anterior Eye
Issue number4
Publication statusPublished - 1 Aug 2016


  • Anterior chamber depth
  • Anterior segment length
  • Myopia control
  • Orthokeratology

ASJC Scopus subject areas

  • Ophthalmology
  • Optometry


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