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Corneal biomechanical parameters, corneal sensitivity: small-incision lenticule extraction versus femtosecond laser-assisted laser in situ keratomileusis

Poster Details

First Author: A.Ghanem EGYPT

Co Author(s):                        

Abstract Details

Purpose:

To compare the biomechanical properties of the cornea and corneal sensitivity after small-incision lenticule extraction (SMILE group) with those after femtosecond laser–assisted laser in situ keratomileusis (femto-LASIK group).

Setting:

Al Nour Femto Laser Center, Mansoura, Egypt

Methods:

A total of 80 eyes and 70 eyes that received SMILE and femto- LASIK procedures, respectively, were enrolled prospectively in this study. Corneal biomechanical properties such as corneal hysteresis (CH), corneal resistance factor (CRF), p1area, and p2 area were quantitatively assessed with the Ocular Response Analyzer. Corneal sensitivity was quantitatively assessed with the Cochet-Bonnet esthesiometry. All eyes assessed preoperatively, 1week, and 1, 3, 6 and 12 months postoperatively.

Results:

Decrease in CH, CRF, p1area, and p2 area was statistically significant one week postoperatively in both groups. These values in the SMILE group were significantly higher than in the femto-LASIK group 3, 6, 12 months postoperatively. Both SMILE and femto-LASIK eyes demonstrated impaired corneal sensitivity and TFBU time immediately after both procedures. Corneal sensitivity and TFBU time values in the SMILE group were significantly higher than those in the femto-LASIK group 3,6,12 months postoperatively. There were significant correlations between postoperative central corneal ablation depth, and preoperative spherical equivalent at 12 months follow up in both groups

Conclusions:

Both SMILE and femto-LASIK procedures can alter the biomechanical properties in the cornea. Changes in the corneal status were less after SMILE than after femto-LASIK. Both central corneal sensitivity and tear-film break up time impaired where the impairment less after the SMILE than after femto-LASIK.

Financial Disclosure:

NONE

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