Affiliation:
1. Aier Academy of Ophthalmology Central South University Changsha Hunan China
2. Hunan Province Optometry Engineering and Technology Research Center Changsha Hunan China
3. Hunan Province International Cooperation Base for Optometry Science and Technology Changsha Hunan China
4. Department of Ophthalmology The Second Affiliated Hospital of Anhui Medical University Hefei Anhui China
5. Aier School of Optometry and Vision Science Hubei University of Science and Technology Xianning Hubei China
Abstract
AbstractPurposeThis study was conducted to determine whether orthokeratology (OK) lenses with a smaller back optic zone diameter (BOZD) could exhibit stronger myopia control effects.MethodA meta‐analysis was registered in PROSPERO (CRD42023408184). A comprehensive systematic database search was conducted, encompassing PubMed, Cochrane Library, EMBASE, MEDLINE, Web of Science, Ovid, CNKI and CBM, to identify relevant studies up to 25 March 2023. The primary inclusion criteria for this meta‐analysis were studies that investigated the myopia control effect of OK lenses with a small optical treatment area (≤5 mm). To assess the quality of the retrieved articles, two researchers evaluated them using the Cochrane bias risk assessment criteria. The primary outcome measures were the changes in axial length (AL) and refractive error, using the weighted mean differences (WMD) and 95% confidence intervals (CI) to assess differences between small and traditional back optical treatment zone groups in terms of these outcomes.ResultsThe analysis encompassed five eligible studies, with a 1 year duration. The average difference in AL between the groups was 0.12 mm (WMD = −0.12, 95% CI [−0.16, −0.09], p < 0.00001). Likewise, the average difference in refractive error between the two groups was 0.44 D (WMD = 0.44, 95% CI [0.30, 0.57], p < 0.00001). None of the studies reported severe adverse events.ConclusionsCurrent evidence suggests that OK lenses with smaller back optical treatment zone are more effective in preventing myopia progression than traditional lenses. However, a longer‐term evaluation is warranted.