Orthokeratology lenses with increased compression factor (OKIC): A 2-year longitudinal clinical trial for myopia control

Jason K. Lau, Kin Wan, Pauline Cho

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

Purpose
To investigate the effectiveness of orthokeratology (ortho-k) lenses and corneal changes with increased compression factor for myopia control over a 2-year period.

Methods
Young participants (age: 6–
Results
A significant number of control (63 %) dropped out, mainly due to concern about myopia progression (58 %). A total of 75 participants (mean age: 9.3 ± 1.0 years; control: n = 11, ortho-k [0.75 D]: n = 29, ortho-k [1.75 D]: n = 35) completed the study. Considering ortho-k groups only, the mean axial elongation of participants wearing ortho-k lenses of conventional compression factor (0.75 D) and increased compression factor (1.75 D) were 0.53 ± 0.29 and 0.35 ± 0.29 mm, respectively, over the 2-year study period. The between-group differences in corneal health were not significant at all visits.

Conclusion
Participants wearing ortho-k lenses of increased compression factor further slowed axial elongation by 34%, when compared with the conventional compression factor without compromising corneal health. Further investigations are warranted to confirm the potential mechanism of an increased compression factor for improved myopia control effectiveness.
Original languageEnglish
Number of pages7
JournalContact Lens and Anterior Eye
DOIs
Publication statusPublished - 19 Aug 2022

Keywords

  • Orthokeratology
  • Myopia

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