Comparison of the Corneal High-Order Aberration and Relative Corneal Refractive Power Distribution Induced by Different Orthokeratology Lenses Designs.

PURPOSE: This study compared the myopia control effects of corneal high-order aberrations (CHOA) from two orthokeratology (OK) lenses based on their relative corneal refractive power shifts.

METHODS

In this prospective cohort study, 101 school children with low to moderate myopia were divided into three groups: group A (N=35) used 3-curve design lenses, group B (N=31) used 4-curve design lenses, and group C (N=35) wore regular spectacles. Cycloplegic refraction, visual acuity, and axial length (AL) were measured at baseline and after one year. Keratometry and CHOA were assessed before and after 3 months of lens wear. Relative corneal refractive power shifts and summed corneal power change (SCPC) were calculated. One-way ANOVA and planned comparison analyzed group differences.

RESULTS

Group B showed significantly slower AL elongation than group A ( P =0.017) after OK treatment. Group B's SCPC was significantly higher than group A's ( P ≤0.005). Group B had a significant increase in horizontal coma ( P =0.004). Increased SCPC led to more coma aberration with four-curve lens wear ( P <0.01).

CONCLUSIONS

The four-curve lens design was more effective in slowing AL elongation for OK treatment. It also caused significantly higher horizontal coma aberration than the three-curve design.