Refractive Multifocal IOL
A refractive multifocal IOL has a combined range of focus from near to far and uses pupil size for the refractive zones. A monofocal IOL has a fixed single focus, and reading glasses are typically required.
Diffractive Multifocal IOL
A diffractive multifocal IOL has a combined range of focus from near to far, regardless of lighting conditions. A monofocal IOL has a fixed single focus, and reading glasses are typically required.
A diffractive multifocal IOL is specially designed to have a combined range of focus from near to far.
Summary
There are several important considerations in your choice of intraocular lenses. It is best to study the features and discuss your needs with your eye care provider.