Therapeutic Areas Therapeutic Areas Surgical Cataract › Vitreoretinal › Visualization › Refractive › Glaucoma › Ocular Health Dry Eye › Contact Lens Contact Lenses › Contact Lens Solutions › Recent 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 Refractive and Diffractive Principles in Presbyopia-Correcting IOLs - An Optical Lesson Intraocular Lenses Multifocality in IOLs is achieved through refractive or diffractive optical approaches Learn More Evolution of Systane® Artificial Tears Dry Eye Artificial tears aim to replicate the natural tears’ composition and physical properties. Learn More View More © 2025 Alcon Inc. p-MED-GAS-NP-250005
