The Treatment Zone Size and Its Decentration Influence Axial Length Grow in Children With Orthokeratology Treatment

Abstract

Background: To investigate whether the treatment zone size (TZS) and treatment zone decentration (TZD) will affect the axial length growth in myopic children undergoing orthokeratology treatment.Methods: A self-controlled retrospective study was conducted on 352 children who met the inclusion criteria. Axial length was measured before and at 12 months after the initial lens wear. Corneal topography was measured at baseline and at each follow-up after lens wear. The Corneal topography obtained from the 12-month visit was used to quantify TZS and TZD for each subject. Cycloplegic refraction was required for all subjects before fitting the orthokeratology lenses. Results: Axial length growth was significantly associated with age, baseline spherical equivalent (SE), TZS, and TZD with univariate linear regression. In groups with both small and large TZS, axial length growth was significantly decreased with large TZD (both P < 0.001). In groups with both small and large TZD, axial length growth was significantly decreased with small TZS (P = 0.027 for small TZD, P = 0.011 for large TZD). Age, SE, and TZD were significantly associated with axial length growth in multiple regression (all P < 0.001). Conclusion: Relatively smaller TZS and larger TZD may be beneficial in slowing myopia progression in children with orthokeratology treatment.