Posters

Role of posterior corneal astigmatism in toric IOL cases after PRK

Poster Details

First Author: S. Takhtaev RUSSIAN FEDERATION

Co Author(s):    K. Boiko                    

Abstract Details

Purpose:

To evaluate the influence of posterior corneal astigmatism on refractive outcome in cases with Toric IOL in patients with history of previous radial keratotomy.

Setting:

Fyodorov Eye Microsurgery State Institute, Saint-Petersburg branch

Methods:

The study included 20 patients (38 eyes) with cataract and astigmatism with Acrysof Toric IOL implanted. Uncorrected visual acuity (UCVA), best corrected visual acuity, refraction, astigmatism, safety, and predictability were analyzed. Change in astigmatism was analyzed with vector analysis. 16 eyes (8 patients) with history of PRK were compared with the control group (22 eyes, 12 patients) by estimation of the minimal residual refractive cylinder.

Results:

Pentacam (Oculus, USA) was used for pre-op corneal topography. Mean preoperative spherical equivalent was 3.73 diopters (D) +/-1.26 (SD). In study group, mean posterior corneal astigmatism was 0.7 D +/- 0.15 (SD). In control group, mean posterior corneal astigmatism was 0.47 +/-0.1 D (Mann-Whitney test). Mean follow-up was 12 months (range 6 to 20 months). 20/20 best spectacle-corrected visual acuity (BSCVA) was seen in 78.2% in both groups. The mean postoperative astigmatism at 6 months was 0.79 D+/-0.25 (postop mean SE 0.6D+/-0.2) in study group and 0.45 +/-0.2 (mean SE 0.3+/-0.1) in control group.

Conclusions:

In our study incidence of posterior corneal astigmatism correlated with residual refractive astigmatism. Suggessions for Toric IOL calculation in eyes with PRK history are discussed.

Financial Disclosure:

NONE