Visual Outcomes of Two Aspheric PCIOLs: Tecnis Z9000 versus Akreos AO

Purpose: To compare spherical aberration and contrast sensitivity with two differenttypes of aspheric posterior chamber intraocular lenses (PCIOLs): Tecnis Z9000 versusAkreos AO.Methods: Thirty-four eyes of 34 patients undergoing phacoemulsification for senilecataracts were randomly assigned to implantation of Tecnis Z9000 or Akreos AOPCIOLs. Outcome measures included best-corrected visual acuity (BCVA), sphericalaberration (SA) with 4 and 6 mm pupil diameters and contrast sensitivity under photopicand mesopic conditions at spatial frequencies of 1, 2, 5, 10 and 20 cycles per degree(cpd) three months postoperatively.Results: Mean BCVA was 0.08±0.08 log MAR in the Tecnis Z9000 group and 0.11±0.09logMAR in the Akreos AO group (P=0.33). SA was less with Tecnis than Akreos AOwith 4 and 6 mm pupil diameter (0.14±0.10(mu)m vs 0.28±0.09(mu)m, P 0.001 and 0.30±0.18(mu)m vs 0.33±0.08 (mu)m, P=0.4, respectively). Contrast sensitivity was significantly higher in the Tecnis Z9000 group at 1, 2, 5 and 10 cpd under photopic and at 1, 2 and 10 cpdunder mesopic conditions.Conclusion: Tecnis Z9000 IOL seems to entail better visual outcomes in terms ofspherical aberration and contrast sensitivity as compared to Akreos AO.