Comparative effects of various types of toric intraocular lenses on astigmatism correction

Session Details

Session Title: Presented Poster Session: Toric IOLs

Venue: Poster Village: Pod 1

First Author: : J.Moon SOUTH KOREA

Co Author(s): :    C. Yoon   M. Kim                    

Abstract Details

Purpose:

To investigate the comparative effects of various toric intraocular lens (IOL) on astigmatism correction in patients with cataract and astigmatism.

Setting:

Retrospective medical chart review of 371 patients who had undergone phacoemulsification with posterior chamber toric intraocular lens (IOL) insertion (front-toric IOL, back-toric IOL or bi-toric IOL) between January 1st, 2010 and August 31st, 2017 at Seoul National University Hospital, Seoul, Korea.

Methods:

Medical records of 371 patients who had undergone phacoemulsification with posterior chamber toric intraocular lens (IOL) insertion (front-toric IOL, back-toric IOL or bi-toric IOL) were retrospectively reviewed. Subjects were divided into 2 groups; subjects who had no history of corneal disease with corneal astigmatism more than 1.25 diopters (D) (G1) and subjects who received previous penetrating keratoplasty (PKP) and had corneal astigmatism more than 2.00 D (G2). Refractive astigmatism, vector analysis (J0, J45) and mean numerical error of spherical equivalents (SE) between intended- and post-operative SE using SRK-T formula were assessed 1 month after cataract surgery.

Results:

Mean preoperative corneal astigmatisms were 2.2 D and 4.0 Din G1 and G2, respectively. There was a significant reduction of mean postoperative refractive astigmatism to 0.89D in G1 and to 2.33D in G2. In G1, Bi-toric IOL showed a greater reduction of astigmatism than front-toric IOL and back-toric IOL. In G2, the astigmatic reduction was not different according to the toric IOL type. In both groups, front and back-toric IOL showed no difference in mean numerical error. However, bi-toric IOL showed a significant hyperopic shift of postoperative SE by 0.29 D.

Conclusions:

Our study suggests that all types of toric IOL are beneficial in correcting astigmatism of normal and post-PKP corneas, and noticeably bi-toric IOL shows a better reduction of astigmatism than the front and back-toric IOLs in normal corneal astigmatism. However, bi-toric IOLs shows a hyperopic shift of SE compared with front- or back-toric IOL.

Financial Disclosure:

None