Posters

Corneal remodeling after myopic SMILE versus FS-LASIK – A spatial analysis of short- and mid-term corneal thickness, volume and shape changes

Poster Details

First Author: A.Lazaridis GERMANY

Co Author(s):    B. Spiru   E. Giallouros   K. Droutsas   W. Sekundo           

Abstract Details

Purpose:

To evaluate the short- and mid-term changes of corneal thickness spatial profile (CTSP), corneal volume distribution (CVD) and corneal asphericity after Small Incision Lenticule Extraction (SMILE) for correction of myopia and astigmatism and compare the results to femtosecond laser-assisted LASIK (FS-LASIK).

Setting:

Department of Ophthalmology, Philipps University of Marburg

Methods:

Thirty eyes of 19 patients who underwent SMILE were compared to a group of 30 eyes of 16 patients who underwent FS-LASIK. The groups were matched for preoperative central corneal thickness and lenticule thickness/ablation depth. Scheimpflug corneal tomography was performed preoperatively and postoperatively at 2 months and 3 years. The CTSP was evaluated on 4 concentric rings (2mm, 4mm, 6mm and 8mm). The CVD was evaluated at 3 concentric zones (3mm, 5mm and 7mm). Changes in anterior and posterior asphericity were evaluated at 6mm zone.

Results:

Between the 2-month and 3-year examination, the CTSP showed a similar increase for both groups at all measured points and rings (P≥0.168). The CVD also showed a similar increase for both groups at all measured zones (P≥0.278). The anterior corneal asphericity remained stable after SMILE (2-month Q=0.46±0.27; 3-year Q=0.45±0.27; P=0.711), but decreased significantly after FS-LASIK (2-month Q=0.52±0.47; 3-year Q=0.47±0.44; P=0.028). Similarly, the posterior corneal asphericity remained stable after SMILE (2-month Q=-0.11±0.15; 3-year Q=-0.11±0.13; P=0.902), but decreased significantly after FS-LASIK (2-month Q=-0.13±0.14; 3-year Q=-0.16±0.15; P=0.034).

Conclusions:

CTSP and CVD between 2-month and 3-year examination showed a similar change after SMILE and FS-LASIK. During the postoperative course, the anterior and posterior corneal asphericity were better preserved after SMILE compared to FS-LASIK.

Financial Disclosure:

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