Outcomes for Acrysof toric intraocular lenses to correct corneal astigmatism in eyes after cataract surgery

Objective To compare the Acrysof toric intraocular lens (IOL) with the Acrysof SA60AT spherical IOL for patients with cataracts and preexisting corneal astigmatism and to investigate the rotational stability of the Acrysof toric IOL.Methods This prospective case-control study was comprised of 104 eyes with more than 1.0 D of preexisting corneal astigmatism.One group of 56 eyes were implanted with Acrysof toric IOL (toric group) and the other 48 eyes were implanted with Acysof SA60AT IOL(control group). Uncorrected (UCVA) and best corrected visual acuity (BCVA), residual refractive cylinder,spectacle independence,total lower order (LOA) and higher order aberrations (HOA),modulation transfer function (MTF) under 5, 10, 15,20,25, 30 cpd,and toric IOL axis were recorded 3 months postoperatively. Data were analyzed using a paired samples t test and an independent samples t test.Results Postoperatively, UCVA (logMAR) was 0.22 ±0.12 in toric group,versus 0.36 ±0.20 in control group (t=4.526,P＜0.01).BCVA was 0.05±0.07in toric group,versus 0.06 ±0.08 in control group (t=0.894,P=0.37).Mean residual refractive cylinder was 0.36 D in toric group versus 1.19 D in control group (t=4.275,P＜0.01).Three-month distance vision spectacle independence was 59％ (toric IOL) versus 32％ (control IOL).LOA in the toric group was significantly lower than that in the control group (t=11.146, P＜0.01), but no significant differences were found in higher order abberration between the two groups.MTF values in the toric group were higher than values in the control group at all spatial frequencies with a 3 mm pupil size (t=8.894,5.750,4.573,4.475,2.968,4.756,P＜0.01).Mean rotation was 5.84°±4.12° (range 0°～18°)for the toric IOL.Conclusion The favorable visual acuity,distance vision spectacle independence,visual quality, predictability, and rotational stability support the use of the Acrysof toric IOL for cataractous patients with corneal astigmatism. Key words: Lenses,intraocular, toric ;  Cataract;  Corneal astigmatism ;  Visual quality ; Spectacle independence;  Rotational stability