An intraocular lens (IOL) is an implanted lens in the eye, typically replacing a cataract-clouded crystalline lens. Most IOLs are made of silicone, acrylic, or other plastic compositions. They are also coated with a special material to help protect your eyes from the sun's harmful ultraviolet (UV) rays. IOLs come in different focusing powers, just like prescription eyeglasses or contact lenses. Your ophthalmologist will measure the length of your eye and the curve of your cornea. These measurements are used to set your IOLs focusing power.
Different types of IOLS:
Monofocal IOLs - one focusing distance. Most people have them set for clear distance vision. Then they wear eyeglasses for reading or close work.
Multifocal IOLs - These IOLs provide both distance and near focus at the same time. The lens has different zones set at different powers.
Extended depth-of-focus IOLs - Similar to multifocal lenses, extended depth-of-focus (EDOF) lenses sharpen near and far vision, but with only one corrective zone, which “extends” to cover both distances. This may mean less effort to re-focus between distances.
Toric IOLs - For people with astigmatism, there is an IOL called a toric lens. Astigmatism is a refractive error caused by an uneven curve in your cornea or lens. The toric lens is designed to correct that refractive error.
As you plan for your cataract surgery, talk to your ophthalmologist about your vision needs and expectations. They will explain IOL options for you in more detail.
