A clinical study to evaluate the results after toric intraocular lens implantation in cases of corneal astigmatism

Abstract

BackgroudModern day cataract surgery aims at a spectacle free vision which becomes difficult in cases with pre-operative astigmatism more than 1.5D. Implantation of toric intra-ocular lenses (IOL) after phacoemulsification in such eyes is one of the ways to counteract this problem. MethodsThirty eyes with pre-operative astigmatism between 1.5D and 4.5D were implanted with toric IOLs following uneventful phaco-emulsification. The estimation of the axis of implantation of this toric IOL included calculating the surgically induced astigmatism (SIA) of the surgeon. ResultsPost-operatively, 20 (66.67%) patients had a visual acuity 6/9 or better and 17 (57%) had a visual acuity of 6/6 at 12 weeks. The mean postoperative uncorrected visual acuity (UCVA) was 0.12±0.15 at 12 weeks. The difference between means of preoperative best corrected visual acuity (BCVA) LogMAR and postoperative UCVA at 12wk LogMAR was found to be statistically significant at p=0.001. Mean (SD) scores of pre-op astigmatism of study group was −2.20 (0.67) and residual astigmatism was −0.32 (0.44). ConclusionsThe difference between means of pre-op astigmatism and residual astigmatism in the study group was significant at p=0.001 with 95% CI −2.22 to −1.50. This significant difference was because of the toric IOL implantation.