An intraocular lens (IOL) is a tiny, lightweight, clear plastic disc placed in the eye during cataract surgery. An IOL replaces the focusing power of the eye’s natural lens.
There are many lenses available:
Monofocal lenses are designed to provide the best possible vision at one distance. Most people who choose monofocals have their IOLs set for distance vision and use reading glasses for near-vision tasks.
Multifocal IOLs have multiple corrective zones built into the lens (much like bifocal or trifocal eyeglasses). This allows you to see both near and far objects. In addition, some multifocal may also correct intermediate vision.
Extended depth-of-focus (EDOF) IOLs have only one corrective zone, but this zone is stretched to allow distance and intermediate vision.
Toric lenses have extra built-in correction for astigmatism.