Discontinuation of orthokeratology on eyeball elongation (DOEE)

Hie Hua Wong, S. W. Cheung

Research output: Journal article publicationJournal articleAcademic researchpeer-review

50 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)82-87
Number of pages6
JournalContact Lens and Anterior Eye
Issue number2
Publication statusPublished - 1 Apr 2017


  • Axial elongation
  • Discontinuation
  • Myopia control
  • Orthokeratology

ASJC Scopus subject areas

  • Ophthalmology
  • Optometry


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