Evaluation of AcrySof Toric intraocular lens for astigmatism correction in cataract patients

Objective To investigate the clinic curative effects and rotational stability of AcrySof Toric intraocular lens (IOL) for corneal astigmatism eorrection in cataract patients.Methods It was a self control study.Different types of AcrySof Toric IOL were implanted in 25 cases (30 eyes)cataract patients with more than 1 D corneal astigmatism by phacoemulsification.Preoperation IOL spherical degree was calculated by ophthalmologic A/B scan.Corneal astigmatism was measured by corneal topography.Lens type and position were calculated by Alcon formula.During the operation,the axis of the Toric lens was alingned to the steepest axis of the corneal astigmatism.Patients were followed up for 3 months.The uncorrected visual acuity,corneal astigmatism,position of the lens and cylinder power were detected and compared before and after the operation.Data were analyzed using paired t test.Results One day postoperation,the mean uncorrected visual acuity (UCVA) was (4.72±0.12).At 3 months,it was (4.96±0.08).Preoperation the mean corneal astigmatism was (1.80±0.45)D,anticipated residual astigmatism was (0.29±0.16)D,3 months postoperation residual astigmatism was (0.33±0.21)D.The difference between preoperative corneal astigmatism and postoperative residual astigmatism was significant (t=3.39,P＜0.05).And the difference between anticipated and actual residual astigmatism was not significant.The mean axis rotation of toric IOL was (5.50±4.07)° 1 day postoperation and (5.68±4.12)° after 3 months.IOL in 14 eyes had rotated less than 2°,IOL in 12 eyes had rotated 2-5°,and IOL in 4 eyes had rotated 5-10°.Conclusion Implantation of Acrysof Toric IOL for correction corneal astigmatism in cataract patients is effective and stable. Key words: Phacoemulsification; Astigmatism; Intraocular lenses