In-Vitro Methods for Comprehensive IOL Optical Performance Assessment

This study introduces novel in-vitro methodologies for the optical assessment of intraocular lenses (IOLs), addressing the recognized gap between standard optical bench measurements and actual visual performance as experienced by patients. A model eye is presented that simulates the human eye’s optical properties while allowing controlled measurements across various conditions. The testing framework incorporates three novel approaches: the High Dynamic Range Point Spread Function (HDR-PSF) method, which captures both fine central details and peripheral light scatter by combining multiple exposures, the Optical Integration Method, which quantifies straylight, and the Through-Focus Objective Letter Sharpness metric, which provides a visually relevant assessment of functional vision across different focal distances. Additionally, a systematic approach for evaluating negative dysphotopsia in the peripheral visual field is presented. These methodologies revealed significant differences in optical performance between various IOL designs, including monofocal, extended depth of focus and multifocal. The techniques provide deeper insights into IOL performance than current ISO and ANSI standards allow, offering more clinically relevant evaluations that better predict patient outcomes. This novel in-vitro testing framework represents an advancement in IOL evaluation, opening the way for improved lens design, better patient satisfaction, and more informed clinical decision-making in cataract surgery.