Observation on the stability of Toric IOL implantation for the cataract with corneal astigmatism

Objective To evaluate the effects of Toric IOL(Acrysof SN60TT) for corneal astigmatism according to the stability of Toric IOL and the corneal cylinder power after Toric IOL implantation.Design Retrospective case series.Participants Three cataract patients(three eyes) with middle or high degree of corneal astigmatism.Methods Toric IOL's spherical equivalent and corneal astigmatism were measured preoperatively.Different types of Toric IOL were implanted according to the ALCON software's calculation results.During the operation,the axis of the toric lens was aligned to the steepest axis of the corneal astigmatism.Preoperative corneal astigmatism were 1.5 D,2.5 D,5.5 D respectively.Cataract phacoemulsification and Toric intraocular lens implantation were taken by the same doctor.AcrysofSN60 T3,AcrysofSN60 T4 and AcrysofSN60 T4 IOL were implanted.Intraocular lens spherical degree was calculated with IOLMaster(Carl Zeiss,Germany) and SRK/T formula.Corneal astigmatism axis was measured by corneal topography,lens type and position were calculated by Alcon formula,inputting the axis of maximum diopter and minimun diopter,surgically induced astigmatism,incision location.Patients were followed up at least more than 1 year.Main Outcome Measures The postoperative visual acuity,position of the lens,cylinder power.Results No postoperative complications were found.A significant improvement in visual acuity was 0.6,1.0,1.0.There was no significant rotation of the lens.The remaining corneal astigmatism was stable after the operation.Conclusion Toric IOL for corneal astigmatism is an effective and stable refractive corrective tool.