Bifocal, Trifocal, and Extended-Depth-of-Focus Intraocular Lenses Demonstrate Good Acuity
October 17, 2016—Chicago, Illinois—Two analyses of bifocal, trifocal, and extended-depth-of-focus intraocular lenses have demonstrated good visual acuity. These results were reported at the 120th Annual Meeting of the American Academy of Ophthalmology, from October 15 – 18.
Mike P. Holzer, MD, of the University of Heidelberg, Germany, explained that in the first study, he and colleagues performed a functional evaluation of three intraocular lenses regarding visual and reading performance at different distances, and associated quality of life.
Eighty-eight eyes were divided into three groups and received a bifocal, trifocal, or extended-depth-of-focus intraocular lens. Postoperatively, distant, intermediate, and near visual acuity, as well as preferred near and intermediate reading distance using a reading desk, were evaluated. A patient questionnaire was also administered.
Distance-corrected near visual acuity was higher in the bifocal group than the trifocal group, followed by the extended-depth-of-focus group. The opposite was the case for intermediate visual acuity.
All three intraocular lenses showed similar preferred intermediate reading distances of approximately 80 cm, with similar reading acuities with the bi- and trifocal intraocular lenses. Halos did not differ statistically significantly among the three groups.
Dr. Holzer concluded that no intraocular lens demonstrated superiority in all aspects, and that the intraocular lens has to fit the patient’s lifestyle.
In the second study, Dr. Holzer evaluated functional outcomes with two trifocal intraocular lenses with different intermediate focal distances: AcrySof IQ PanOptix (Alcon Inc.) and AT Lisa tri (Carl Zeiss Meditec AG).
Patients receiving cataract and clear lens exchange with implantation of PanOptix or AT Lisa tri were examined 3 months postoperatively. Refraction, uncorrected/corrected distance, uncorrected/distance-corrected intermediate (60 or 80 cm), uncorrected/distance corrected/corrected near visual acuities (40 cm) were assessed.
Twenty-eight eyes that received the PanOptix and 27 that received the AT Lisa tri were examined. Median visual acuities (PanOptix/AT Lisa tri) were as follows:
- Uncorrected/corrected distance 0.04/0.04 logMAR
- Corrected distance −0.01/−0.02 logMAR
- Uncorrected distance 60/80 cm, 0.02/0.02 logMAR;
- Distance corrected 60/80 cm, 0.04/0.02 logMAR
- Uncorrected distance 0.05/0.10 logMAR
- Distance corrected near distance 0.00/0.08 logMAR
Dr. Holzer concluded that both trifocal intraocular lenses revealed good results for distance, intermediate, and near visual acuity, with slight differences in the second peak of monocular defocus curves.
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