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.