What is the primary function of the "optic" portion of an intraocular lens (IOL)?

The primary function of the "optic" portion of an intraocular lens (IOL) is to focus light on the retina. When the natural lens of the eye is removed during cataract surgery, the IOL is implanted to replace it. The optic zone of the IOL is designed to have specific optical properties that will direct and focus light appropriately onto the retina, allowing for clear vision.

The design and curvature of the optic are critical, as they directly influence how light is manipulated as it passes through to the retina. This process is essential for visual clarity and is a fundamental purpose of an IOL. The focusing capability of the optic is what enables patients to regain their vision after cataract surgery, which is crucial for their daily activities and overall quality of life.