Corneal remodeling after myopic SMILE vs FS-LASIK: a spatial analysis of short and mid-term corneal thickness, volume and shape changes

Session Details

Session Title: Moderated Poster Session: Refractive
Session Date/Time: Saturday 16/02/2019 | 14:00-15:00
Paper Time: 14:16
Venue: Poster Area


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, corneal volume distribution and corneal asphericity after SMILE for correction of myopia and astigmatism and compare the results to FS-LASIK

Setting:

Department of Ophthalmology, Philipps University of Marburg, Germany

Methods:

Thirty eyes which underwent SMILE were compared to 30 eyes which underwent FS-LASIK. The groups were matched for preoperative central corneal thickness (CCT) and lenticule thickness/ablation depth. Scheimpflug corneal tomography was performed preoperatively and at 2 months and 3 years postoperatively. The corneal thickness spatial profile (CTSP) was evaluated at 4 concentric rings (2, 4, 6 and 8mm) around the point of minimum corneal thickness (MCT). The corneal volume distribution (CVD) was evaluated at 3 concentric zones (3mm, 5mm and 7mm) around the corneal apex. Changes in anterior and posterior corneal asphericity at 6mm zone were also evaluated.

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:

During the postoperative course, CTSP and CVD showed a similar change after SMILE and FS-LASIK. The asphericity of the anterior and posterior cornea was better preserved after SMILE.

Financial Disclosure:

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