Normative Values on Stromal Curvature, Power and Corneal-Stromal Curvature Ratios From a Hybrid AS-OCT.

BACKGROUND

To establish normative values for stromal curvature and its relationships to anterior and posterior curvature.

METHODS

Retrospective observational study. Data were obtained from 75 eyes of cataract surgery patients using a high-resolution anterior segment optical coherence tomograph (AS-OCT; MS-39, CSO). Data analysis included anterior, stromal, and posterior curvature across multiple zones (1.0-5.0 mm), and derived curvature ratios.

RESULTS

The anterior-to-stromal curvature ratio (ASR) remained stable (1.016-1.007), while the stromal-to-posterior (SPR) and anterior-to-posterior (APR) ratios exhibited trends of slight change (SPR: 1.149-1.167; APR: 1.167-1.175). The refractive power analysis revealed incremental effects across one, two, and three refractive surface models, emphasising the importance of integrating posterior and stromal curvature data into optical assessments.

CONCLUSION

This study provides the first normative values for stromal curvature and its ratios with anterior and posterior curvature. These findings may have implications for corneal- and lens-based surgeries and diagnostics.