An intraocular lens (IOL) is a medical device implanted in the eye to replace the natural lens after cataract surgery or to correct vision problems. Made from clear plastic or silicone, IOLs help focus light onto the retina, improving vision clarity. They come in various types, including monofocal, multifocal, and toric lenses, each designed for specific vision needs. IOLs are typically inserted through a small incision during an outpatient procedure. After the surgery, patients often experience a significant improvement in their vision, allowing them to resume daily activities without the need for glasses or contact lenses.