To compare visual outcomes between mini-scleral lenses and small-diameter rigid GP lenses in individuals with moderate-to-severe keratoconus, and to evaluate the clinical utility of corneal topographic indices in guiding lens selection.
Key Findings:
Both lens types significantly improved BCVA after fitting, with RGP lenses showing lower surface regularity index and irregular astigmatism index but higher center-surround index compared to SLs.
Lower center-surround index values were associated with greater visual improvement, indicating a potential predictor for lens selection.
Interpretation:
Cone location may be more influential than corneal steepness in predicting success with RGP lenses, highlighting the importance of topographic indices in lens fitting.
Limitations:
Retrospective design may limit findings.
Small sample size in SL group (n=6) reduces statistical power.
Potential selection bias due to all SL eyes having apical scarring, which may affect the generalizability of the results.
Conclusion:
Both mini SLs and small-diameter RGPs significantly improve BCVA in moderate to severe keratoconus, with topographic indices aiding in lens selection and predicting visual outcomes.
