Comparison of the Binocular Vision Quality After Implantation of Monofocal and Multifocal Intraocular Lenses

Aim. To compare binocular vision quality following unilateral implantation of either a monofocal or multifocal IOL. Methods. A prospective randomized double-blind study of postoperative binocular vision quality that included 100 patients with monocular cataract from regular operating program at the Eye Clinic UCC Tuzla. Patients were randomized into two groups of 50 patients, with implanted refractive multifocal zone-progressive IOL(AMO model NXG1) or monofocal IOL (Alcon AcySof model MA60BM). Parameters essential to evaluate the binocular vision quality were tested 6 weeks after surgery. Function of fusion was tested with a Bagolini-Maddox test with striped glasses and a cross at 6m distance. Stereo vision was tested with the Titmus stereotest with polaroid glasses at 40cm distance. Results. Unaided near visual acuity was significantly better in “multi” group, while unaided distance visual acuity was almost same in both groups. Analysis of intraocular implant influence on the basic binocular vision functions, showed that 42(84%) patients in “multi” and 36(72%) patients in “mono” group had normal finding and there was no statistically significant difference between the groups. In stereo vision test, threshold of 100 arc seconds was achieved in 34(68%) in “multi” and 11(22%) patients in “mono” group. This difference was statistically significant. Conclusion. Lower levels of binocular vision are better after implantation of multifocal IOL rather than those with implanted monofocal IOL, but not statistically significant. In higher level of binocular vision there is a statistically significant improvement in binocular vision in favor of the multifocal IOL.