Evaluation of visual outcomes after toric intraocular lens implantation

ABSTRACT

Purpose: To evaluate postoperative visual acuity, refractivestatus and rotational stability of toric intraocular lens (IOL)in correcting pre-existing corneal astigmatism.Methods: A total of 69 patients with topographic cornealastigmatism of 1.0 Diopter (D) and above who underwentcataract surgery between June 2015 and December 2016were included in this retrospective observational study. Allpreoperative toric IOL calculations were performed usingimmersion biometry. Appropriate formula to calculate toricIOL power was applied (SRK/T, Holladay 1 or Hoffer Qformula). All patients undergone similar uncomplicatedphacoemulsification with implantation of AcrySoft IQ SN6ATtoric IOL of different powers. Visual outcome, refractivestatus and axis of lens were evaluated at six weekspostoperatively. Ethical approval from the Ministry of HealthMedical Research Ethics Committee was obtained prior tocommencement of study.Results: The mean refractive astigmatism decreased from1.69 D ±1.10 (SD) to 0.81 D ± 0.40 (SD) at six weekspostoperatively. The mean postoperative sphericalequivalent was at -0.37 D ±0.64 (SD). Mean LogMAR foruncorrected and corrected distance visual acuity in sixweeks postoperative patients was at 0.29 ±0.16 (SD) and 0.12±0.12 (SD) respectively. Intraoperative to 6 weeks ofpostoperative comparison of IOL axis alignment showed lowlevels of rotation (mean 3.21 ±2.52 degrees).Conclusion: Cataract surgery with implantation of toric IOLwas stable and effective in improving pre-existing regularcorneal astigm