An IOL, or intraocular lens, is a small, artificial lens implanted in the eye to replace the natural lens that may have been removed during cataract surgery. Cataracts cause the natural lens to become cloudy, leading to blurry vision. The IOL helps restore clear vision by focusing light onto the retina, allowing individuals to see more clearly. There are different types of IOLs, including monofocal, multifocal, and toric lenses. Each type serves a specific purpose, such as correcting nearsightedness or farsightedness. Patients can discuss their options with their eye doctor to choose the best IOL for their vision needs and lifestyle.