Cataract surgery with bilateral multifocal ReZoom intraocular lens implantation – comparison of 3 and 12 months follow-up

Introduction
To evaluate the visual outcome, spectacles independence, contrast sensitivity (CS), subjective symptoms, patient satisfaction and complications three and 12 months after cataract surgery with bilateral ReZoom multifocal refractive intraocular lens (IOL) implantation.

Material and methods
This study comprised 40 eyes of selected 20 patients who had uneventful cataract surgery with bilateral implantation of ReZoom (AMO) multifocal IOL. Three and 12 months after bilateral surgery binocular uncorrected, the best corrected distance, near and uncorrected intermediate visual acuities (VA), spectacle independence, the best corrected binocular distance (with and without glare), near photopic CS, subjective symptoms, patient satisfaction and complications were evaluated.

Results
Three and 12 months after surgery all patients had binocular uncorrected distance visual acuity (VA) of 0.5 or better; the best corrected distance VA was 1.0 in all cases. Three months after surgery, the mean binocular uncorrected intermediate VA was J4.10. The mean binocular uncorrected and the best corrected near VA were J3.10 and J1.70 respectively. Total spectacle independence and independence for distance, intermediate and near vision were achieved in 65%, 100%, 95% and 70% of patients respectively. The best corrected binocular distance and near CS were within normal limits. The most frequent subjective symptoms were mild glare and halo (65% – 13/20 of patients).Total vision satisfaction was very high (9.6/ 10). There were no postoperative complications. One year after surgery, statistically significant improvement occurred in the best distance corrected near VA (p<0.04), photopic distance best corrected CS without glare for 12 cycl/deg (p<0.03) and in the level perception of glare/halo (p<0.02) in comparison to the results from 3 months follow-up. The rest of analyzed parameters was unchanged. No complications were noticed except posterior capsule opacification in four patients one year after surgery who needed YAG laser treatment.

Conclusions
Bilateral ReZoom multifocal IOL implantation was effective in selected cataract patients, providing very good uncorrected distance, intermediate, and near visual acuities as well as very high level of patient satisfaction. Longer than three months of the neuroadaptation time after bilateral surgery is necessary to obtain significantly better visual function results.