Association between ABO and Rh blood groups and choroidal structural parameters in adult population

While SA, LA, and TCA values vary across ABO blood groups-particularly elevated in blood group B-CVI remains stable, suggesting a proportional expansion of stromal and vascular components. These findings imply a potential genetic influence of blood group antigens on choroidal morphology without affecting vascular density. Further large-scale, multiethnic studies are warranted to validate these associations.