An optical method for deriving the anterior and posterior curvatures of intraocular lenses using dual back-vertex power measurements.

ABSTRACT: We present a theoretical framework to estimate the anterior and posterior radii of curvature of a thick intraocular lens (IOL) by measuring its back-vertex power in two orientations. Armed with the lens thickness, refractive index, and a potential axial offset d from haptic angulation, one can determine the individual surface powers and, thus, the geometry of the implant. Using paraxial optics, we derive the back-vertex power in normal and flipped orientations. We consider two cases: d = 0 (no haptic-induced offset) and [Formula: see text] (finite shift). In the d = 0 case, using standard paraxial relations (y-[Formula: see text] method), we obtain compact expressions that allow direct recovery of the surface powers from the dual back-vertex powers. For [Formula: see text], the measured po

SUBMITTER: Gatinel D 

PROVIDER: S-EPMC12671823 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature