Cataract Diagnostics and Equipment Evaluation of predicted spherical equivalents from three biometers in short, medium, and long eyes Aug 11, 2025 Sam Multack, DO, ABO Related Publications SS-OCT Biometers Using the SOS versus Mean Group Refractive Index to Measure Axial Length Cataract Diagnostics and Equipment Today’s SS-OCT Biometers employ two methods to measure the axial length: Sum-of Segments using individual refractive indices or a Mean Group Refractive Index Learn More ↑