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.