Zaina Al-Mohtaseb, MD, and Douglas D. Koch, MD, delve into the realm of optics and aberrations. They cover a range of topics, including spherical and chromatic aberrations, ABBE numbers, and residual refractive error. Additionally, they explore various intraocular lens (IOL) designs, emphasizing the impact of these designs and manufacturing processes on visual quality.This activity is supported by independent medical education grants from Alcon, Johnson & Johnson Vision, and STAAR Surgical.