Posters

Comparison of corneal biomechanical changes after LASIK and Femto-SMILE with CorVis ST

Poster Details

First Author: H.Saad EGYPT

Co Author(s):    E. Abd El-Fattah   A. Ghoneim   A. El Dorghamy              

Abstract Details

Purpose:

To evaluate changes in Corneal Biomechanics after LASIK and Femto-SMILE.

Setting:

Elite Center, Tanta, Egypt.

Methods:

Design: Prospective, non-randomized, unmasked, interventional comparative case series. Patients and Methods: 60 eyes, candidates for refractive surgery, were equally divided into two groups; Group A: received LASIK and group B: received Femto-SMILE. Pentacam and CorVis ST parameters were compared before and 6 months after procedures. P≤0.05 was used for significance of results.

Results:

IOPb decreased by 0.662±1.511mmHg in group A (P=0.092), and by 2.52±1.389mmHg in group B (P<0.001) and the difference between groups became significant (P=0.001). DA increased significantly in both groups (P<0.001, P=0.022), but the difference between groups remained insignificant (P=0.461). IR increased significantly in Group A (P<0.001) and insignificantly in group B (P=0.557) and the postoperative difference between groups was significant (P= 0.026). ARTH decreased in both groups (P=0.245, P=0.695) and the difference remained insignificant (P=0.928). SP-A1 decreased in group A by 0.157±1.389mmHg/mm (P=0.637), and by 1.316±0.939mmHg/mm in group B (P<0.001) and the postoperative difference between groups was significant (P=0.013). CBI increased significantly by 0.445±0.316 in group A (P<0.001), but insignificantly by 0.060±0.029 in group B (P=0.098) and postoperative difference between groups was highly significant (P<0.001). A significant correlation was found between change in CCT and corresponding changes in DA, IR and ARTH after surgery in both groups.

Conclusions:

The significant differences between groups postoperatively as regards IOPb (P=0.001), IR (P=0.026), SP-A1 (P=0.013) and CBI (P<0.001) indicate stiffer corneas after Femto-SMILE and suggest less influence on Corneal Biomechanics than LASIK.

Financial Disclosure:

None