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Impressum
Multifocal intraocular lenses
Jacobi F. K.
Zentrum für Augenheilkunde, Universitätsklinikum Gießen
Multifocal intraocular lenses (MIOL) have been designed for the correction
of presbyopia after cataract surgery and intraocular lens implantation.
Despite their introduction to the market more than ten years ago, MIOL
have not gained wide acceptance among ophthalmologists. The reasons are
prevailing difficulties in targeting postoperative emmetropia and tradeoffs
inherent in MIOL such as a reduced image contrast and increased glare
disability. MIOL of birefringent construction or diffractive MIOL with
an asymmetrical light distribution for the far and near focus (asymmetrical
diffractive MIOL) may offer an effective alternative to conventional refractive
and diffractive MIOL designs. Simulation studies using a special optical
apparatus have demonstrated that visual functions after "optical
implantation" in probands vary according to the specific optical
properties of the different types of MIOL. Preliminary results after bilateral
implantation of the twin pair of asymmetrical diffractive MIOL suggest
a valid concept in presbyopia correction in pseudophakic eyes with a minimal
reduction in contrast sensitivity. However critical to success after MIOL
implantation is the achievement of postoperative emmetropia and patients'
desire to become spectacle independent.