Correlating optical bench performance with clinical defocus

Several multifocal intraocular lens (IOL) designs are available for restoring distance and near vision simultaneously.1 Different studies have confirmed the efficacy of multifocal IOLs to provide good functional vision without the use of corrective lenses.1,2-6 However, optical side effects such as decreased contrast sensitivity, glare disability, or halos have also been reported. Recently, two new multifocal IOL technologies have been introduced into clinical practice: the varifocal IOL and the trifocal multifocal IOL.