Comparison of Corneal Biomechanical Factors after Small Incision Lenticule Extraction (SMILE) and Photorefractive Keratectomy (PRK), using Corvis-ST.
Soheyla Jafarpour1 *, Samira Hassan zadeh 2 , Ghazaleh Daraee3
- Siamak Zarei-Ghanavati
- Elham Bakhtiari
- Sahar Darabi Monadi
Abstract: Objective: To evaluate and compare corneal biomechanical factors after Small Incision Lenticule Extraction (SMILE) and Photorefractive Keratectomy (PRK) surgical techniques, using the Corneal Visualization Scheimpflug Technology (Corvis-ST)
Methods: Methods: Seventy-three patients who were eligible for refractive surgery were allocated to PRK (36 patients) and SMILE (37 patients) groups. Patients underwent thorough ophthalmology and optometry assessment and Corvis corneal biomechanical properties recorded and compared between two groups, before, and 1 and 3 months after surgery.
Results: Results: During three months post-operative follow up, corneal biomechanical factors changed significantly in both groups (all, p<0.05), except Velocity 1, App 2 length and peak distance in the PRK group (p=0.276, p=0.10 and p=0.12) and velocity 2 (p=0.238) in SMILE group. Three months postoperatively, patients in the PRK group showed significantly better results for deformation amplitude ratio and Integrated Inverse Concave Radius (p=0.031 and p=0.027).
Conclusion: Conclusion: Both SMILE and PRK refractive surgeries significantly affect Corvis- ST corneal biomechanical properties. In the short-term, patients who underwent PRK seems to have better corneal biomechanics.
