Posters

Evaluation of clinical outcomes of toric intraocular lens implantation: a 3 years cohort study

Poster Details

First Author: V. Webers THE NETHERLANDS

Co Author(s): N. Visser   N. Bauer   I. Saelens   H. Beckers   C. Webers   R. Nuijts     

Abstract Details

Purpose:

To evaluate the outcome of toric intraocular lens (IOL) implantation performed in a 3-year period at the University Eye Clinic Maastricht, Netherlands.

Setting:

All toric IOL implantations performed at our institution (University Eye Clinic Maastricht, Netherlands) between June 2013 and June 2016 were included.

Methods:

A total of 310 eyes, undergoing toric IOL implantation, were retrospectively analyzed. In the majority of cases (>90%) an Acrysof SN6ATT tIOL-model (SN6AT3-SN6AT9) was implanted with the assistance of the VERION Image Guided System. K-readings obtained with the IOLMaster were transferred into a web-based first generation toric calculator (Acrysof Toric Calculator). Astigmatism axis orientation was with-the-rule (WTR) in 61% and against-the-rule (ATR) in 25% of cases. Outcome measurements were residual refractive astigmatism, uncorrected distance visual acuity (UDVA), misalignment, surgically induced astigmatism (SIA), correction index (CI), and complications. Vector analyses by Alpins was performed to measure the effect of astigmatism treatment.

Results:

Preoperative mean anterior- and posterior corneal astigmatism were respectively-2.45±1.16D and-0.46±0.27D. The mean residual refractive astigmatism was -0.57±0.56D and mean UDVA was -0.12±0.18Logmar. The mean postoperative misalignment was 3.3±3.7⁰. Misalignment of>5⁰ and>10⁰ was present in respectively11% and 5%of cases. SIA was 0.19D@38⁰ with a mean magnitude of 0.60±0.29D. The CI was 1.22±0.20 in the WTR-group and 1.01±0.19 in the ATR-group. Overcorrection of >0.5D was seen in 43%of cases in the WTR-group compared to 8%in the ATR-group. Repositioning was desired in2%, whereas additionalLASEK and IOL-exchange both were required in 1%of cases.

Conclusions:

This study showed that toric IOLs are highly effective in the treatment of pre-existent corneal astigmatism in patient undergoing cataract surgery. A general overcorrection was seen in WTR patients, which might be explained by the use of a first generation toric calculator neglecting the posterior corneal astigmatism. Secondary treatment (e.g. repositioning, additional LASEK, and IOL-exchange) was required in a low percentage of cases.

Financial Disclosure:

receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented, receives consulting fees, retainer, or contract payments from a competing company