Dovepress Statistical analysis of data Statistical analysis of the data was carried out with SPSS software (v 17.0; IBM Corporation, Somers, NY). A t-test was used to compare related samples. This technique is especially indicated for the analysis of differences between the means of two variables within the same study group. P values of less than 0.05 were taken as the reference for statistical significance. Results The average age of the patients in the group was 67 ± 7 years. Mean uncorrected distance visual acuity (logMAR) at 15, 30, and 60 days was 0.194 ± 0.054 vs 0.119 ± 0.026 vs 0.076 ± 0.014 (P , 0.0001), respectively (Table 1). Of the eyes operated, 74.3% had a distance vision of 0.1 logMAR or better at 60 days of surgery. The spherical equivalent obtained at 60 days post-surgery was −0.08 ± 0.56 D. The develop- ment of uncorrected distance visual acuity from day 15 to day 60 of the postoperative follow-up was very satisfactory and improved by 0.118 logMAR (P , 0.0001). The mean visual acuity (logMAR) with postoperative correction of distance vision at 15, 30, and 60 days was 0.051 ± 0.007 vs 0.041 ± 0.004 vs 0.022 ± 0.002 (P , 0.0001), respectively. The proportions of patients with best-corrected and uncorrected near visual acuity Jaeger values at 15, 30, and 60 days are shown in Table 2. Most of the eyes (94.3%) could read Jaeger J1 without correction at 60 days after surgery. None of the eyes read Jaeger J4 at the final follow-up and only two eyes read Jaeger J3. It is interesting to note the positive development experienced by the eyes that were eventually able to read Jaeger J1 in the course of the three follow-up visits; vision improved by an average of 30.7% (P , 0.0001) in each examination. The results of the visual satisfaction questionnaires indi- cated that 90.0% of patients rated their distance vision as good to very good and 97.1% rated their near vision as good to very good. Therefore, their overall vision was very satisfac- tory. None of the patients in the sample rated their distance or near vision as insufficient, as shown in Tables 3 and 4. According to the surgeon satisfaction survey, visual per- formance achieved by patients was rated as very good for near vision in 98.6% and very good for distance vision in 100%. Photic adverse effects disappeared in most cases at 60 days; 88.6% had none, 10.0% had mild effects, and only 1.4% had moderate effects. Contrast sensitivity16 was almost unaffected by the implant, reaching values of 1.64 ± 0.10 (P , 0.0001) Clinical Ophthalmology 2012:6 J4 17.14 1.43 0.00 0.00 0.00 0.00 405 Visual performance with a new multifocal intraocular lens Table 1 Development of uncorrected and best-corrected distance visual acuity (logMAr) Follow-up Uncorrected Best-corrected visual acuity visual acuity 15 days 0.194 ± 0.054 0.051 ± 0.007 30 days 0.119 ± 0.026 0.041 ± 0.004 60 days 0.076 ± 0.014 0.022 ± 0.002 Abbreviation: logMAr, logarithm of the minimum angle of resolution. in 75.7% of cases 60 days after surgery (Table 5). The average contrast sensitivity for the entire sample was 1.63 ± 0.10. In a previous study that was carried out with the Tecnis ZM900 intraocular lens,17 contrast sensitivity was 1.44 ± 0.26 as evaluated with the Pelli–Robson test under the same conditions, but at 210 days. This means that better contrast sensitivity values were obtained with the Tecnis ZMB00 multifocal intraocular lens in a much shorter follow-up time. Posterior capsular opacity did not occur in any patients studied during the entire follow-up period, so it did not influ- ence data analysis. Discussion In this study, a sample of 70 eyes implanted with Tecnis ZMB00 multifocal intraocular lenses was analyzed during a follow-up of 15, 30, and 60 days, respectively. Of the eyes operated, 74.3% achieved distance vision of 0.097 logMAR or more at 60 days after surgery, and 94.3% could read Jaeger J1 without requiring vision correction at 60 days. Of the patients, 90% rated their distance vision without correction as good to very good at 60 days of postoperative follow-up, and 97.1% had the same opinion of their near vision at 60 days of post- operative follow-up. The surgeon rated overall vision as good for distance vision in 100% and for near vision in 98.6%. Of the total, 88.6% stated in the evaluation questionnaire that they had not experienced adverse effects, and only 1.4% experienced moderate effects. Of the operated eyes, 75.71% had a contrast sensitivity of 1.64 ± 0.10 (logarithmic units) measured with the Pelli–Robson test, the average of all eyes being 1.63 ± 0.10. Table 2 Proportion of patients (%) with best-corrected and uncorrected near visual acuity Jaeger values at 15, 30, and 60 days Follow-up Uncorrected visual 15 days acuity 30 days 60 days Best-corrected visual 15 days acuity 30 days 60 days J1 17.14 48.57 78.57 57.14 85.71 94.29 J2 47.14 34.29 18.57 40.00 12.86 4.29 J3 18.57 15.71 2.86 2.86 1.43 1.43 submit your manuscript | www.dovepress.com Dovepress