A study on evaluation of acrysof toric intraocular lens implantation to correct pre-existing corneal astigmatism in patients undergoing cataract surgery- At a tertiary care hospital

Abstract

The current study evaluates the results of acrysof toric intraocular lens implantation to correct pre-existing corneal astigmatism in patients undergoing cataract surgery. This study was done on Prospective interventional at Osmania Medical College, Sarojini Devi Eye Hospital, Hyderabad. The sample of the study is included 40 eyes of 38 consecutive patients with 1.5 D or more of pre-existing astigmatism consists of cataract surgery with toric open-loop IOL implantation (Alcon, Fort Worth, TX, USA). The pre-operative markings for the position of incisions and IOL placement were being done under the slit lamp. The visual acuity, residual keratometric and refractive cylinders, and toric IOL axis were being measured. 54.71 years was the mean age of the patients. All the 40 eyes at the final check-up had post-operative unaided visual acuity of 6/12 or better. 10 patients (25 %) had an unaided visual acuity of 6/6.37 eyes (92.5%) had best corrected post-operative visual acuity of 6/9 or better. The mean pre-operative refractive astigmatism in 40 eyes was 2.34D. 22 eyes had the Refractive astigmatism of >2D. No eyes had refractive astigmatism of <1.5D. The mean axial length was 24.22mmOut of 40 eyes in which Toric IOL was implanted, the post-operative residual refractive sphere was seen in 4 eyes. Out of 40 eyes in whom Toric IOL was implanted, a post-operative residual refractive cylinder was seen in 30 eyes. 10 patients had No post-operative refractive cylinder. The mean post-operative residual refractive cylinder was 0.58D. The mean Post-operative Keratometric cylinder was 2.24D. The mean post-operative Keratometric cylinder was 2.34D. In comparison, both pre-operative and post-operative keratometric astigmatism, it was found that there was no statistically significant difference between them.The misalignment of Toric IOL was 10 degrees or less in 36 patients (94.73%) and less than 5 degrees in 22 patients (57.89%). Misalignment of >10 degrees (11 degrees and 13 degrees) was seen in 2 patients. The mean IOL rotation among 38 patients was 4.55 degrees (Range 0-13 degrees, SD 3.43). None of the eyes required repositioning. The results of this study show that implantation of AcrysofTor ic IOL is a good surgical method to evaluate pre-existing corneal astigmatism in cataract surgery. Acrysoftoric IOL has shown good rotational stability.