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G. Bolognesi, F. Fasce, A. Spinelli, V. Odazio, R. Brancato; Difference in Quality of Vision between Two Silicon IOLs: 911A versus Tecnis Z9000 . Invest. Ophthalmol. Vis. Sci. 2003;44(13):251.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: To evaluate the intra-individual differences in the quality of vision in patients who underwent standard cataract surgery in both eyes with Pharmacia Tecnis Z9000 IOL in one eye and Pharmacia 911A silicone IOL in the fellow eye. Methods: 15 patients, 6 males and 9 females, with bilateral senile cataract, underwent cataract phacoemulsification and in-the-bag IOL insertion in both eyes. Implantation in the fellow eye was done 3-6 months after the first eye surgery; the patients were randomized to receive the Pharmacia Tecnis Z9000 lens in one eye (Group 1) and the Pharmacia 911A silicone lens in the other eye (Group 2). Patients were evaluated preoperatively and after 15, 30, 90 days, checking for best corrected visual acuity (BCVA), intraocular pressure (IOP), posterior capsular opacification (PCO) and contrast sensitivity with long distance vision contrast sensitivity charts. They also were evaluated with aberrometry after 3 months. Results: Pre-op mean BCVA was 0.47±0.07 in Group 1, 0.46±0.18 in Group 2, post-op mean BCVA after 3 months was respectively 0.95±0.07 (Group 1), 0.96±0.07 (Group 2). The mean pre-op IOP (mmHg) was 15.67±2.41 (Group 1) and 15.67±2.26 (Group 2), mean post-op IOP was 14.40±2.67 (Group 1) and 14.33±2.23 (Group 2). Long-distance vision contrast sensitivity tests after 3 months showed a better contrast sensitivity at all spacial frequencies and lighting conditions in patients of Group 1 compared to Group 2, although it was not statistically significant, either in mesopic and scotopic conditions. Contrast sensitivity was better in mesopic conditions in both groups. Conclusions: Tecnis Z9000 IOL has a prolate-front surface to reduce spherical aberrations. This seems to assure a better contrast sensitivity in patients who underwent cataract surgery if compared with 911A IOL, although there is not a statistical significance. These data are confirmed by aberrometry. The other parameters evaluated (BCVA, IOP, PCO) do not show any difference between the two groups. Table of Contents
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