Characteristics of preoperative and postoperative astigmatism in patients undergoing Descemet's membrane endothelial keratoplasty

Session Details

Session Title: Presented Poster Session: Equipment, Instrumentation & Surgical Devices

Venue: Poster Village: Pod 1

First Author: : M.Shajari GERMANY

Co Author(s): :    C. Kolb   I. Schmack   W. Mayer   G. Steinwender   S. Priglinger   T. Kohnen        

Abstract Details

Purpose:

To evaluate the characteristics of preoperative and postoperative astigmatism in patients undergoing Descemet membrane endothelial keratoplasty (DMEK).

Setting:

Department of Ophthalmology, Goethe University, Frankfurt, Germany.

Methods:

53 eyes of 45 patients with Fuchs’ endothelial dystrophy (FED) were included. Measurements were obtained using a Scheimpflug camera (Pentacam AXL, Oculus) preoperatievly, at 3 and 12 months postoperatively. Values of front and back astigmatism and total astigmatism of the central 4 mm diameter zone (TCA4) were analyzed.

Results:

In patients with FED, the prevalence of astigmatism above 1 diopter is considerably higher(79%) and astigmatism WTR is less frequent than in the healthy population. TCA4 correlated with anterior astigmatism preoperatively and postoperatively(P<0.001), as well as with posterior astigmatism at the 1-year follow-up(P<0.01). Although, no correlation was found between preoperative and 1-year results for anterior(P=0.12), posterior(P=0.35), and total corneal astigmatism(P=0.47), difference in vector analysis between both measurements was only 0.01 at 109° for anterior, 0.03 at98° for posterior, and 0.02 at157° for total corneal astigmatism. However, the higher the preoperative TCA3-TCA5- discrepancy, the more the corneal astigmatism decreased.

Conclusions:

The percentage of eyes with corneal astigmatism above 1 D is higher pre- and postoperatively in patients with FED compared to a healthy population. Prediction of postoperative astigmatism based on preoperative results is not possible but in eyes with a high discrepancy between TCA3-TCA5 a reduction in corneal astigmatism after DMEK is likely.

Financial Disclosure:

None