The present paper presents a review of multifocal intraocular lenses (IOLs) focusing on the optical principle used to create multifocality: refraction and diffraction. The principal optics of the different IOL designs in the market were discussed and compared. The main conclusion of this study states that diffractive bifocal optics seems to be superior to refractive designs which is well-substa...

To achieve a vision as similar as possible to before presbytia has become the objective of cataract surgery, popularising multifocal intraocular lens implantation in the last few years. This hypothetical benefit is not alien to glaucoma patients who need cataract surgery. Multifocal intraocular lenses provide an independence from glasses to a high percentage of patients; however, after implanta...

We interpreted the clinical data from 16 eyes with a 3M multifocal implant and compared them with data from 16 monofocal implants with the same follow-up period. The multifocal implant has several disadvantages: a lower initial visual acuity, a higher frequency of posterior synechiae, and slightly more difficult ophthalmoscopy than with conventional lenses. The great advantage of the multifocal...

PURPOSE To compare the clinical outcome of different multifocal intraocular lenses (IOLs) based on information reported in the international literature. METHODS All comparative clinical trials that involved implanting at least one multifocal IOL in patients with cataract or presbyopia were extracted from the literature. Clinical outcomes included uncorrected near visual acuity, uncorrected di...

New multifocal phase designs aiming at expanding depth of focus in the presbyopic eye are presented. The designs consist of multiple radial or angular zones of different powers or of combined low- and high-order aberrations. Multifocal performance was evaluated in terms of the dioptric range for which the optical quality is above an appropriate threshold, as well as in terms of the area under t...

Presbyopia is the gradual inability to focus near objects with age. This study explores patients’ attitudes and beliefs towards presbyopia including preferred modes of refractive correction. In United Kingdom, twenty-four volunteers completed an online questionnaire attended a structured, recorded group. Participants’ age ranged between 36 48 years, representing pre-presbyopic presbyopic popula...