Abstract: Different types of corneal refractive surgery have different effects on corneal biomechanical characteristics due to different cutting methods and cutting depth. Large incision and large cutting amount have great effects on corneal biomechanical characteristics. Regarding the impact of corneal biomechanics alone, current studies have shown that PRK is smaller than SMILE, followed by LASIK and FS-LASIK. The ocular response analyze（ORA）and corneal visualization scheimpflug technology（Corvis-ST）were used to measure corneal biomechanics, excluding patients with poor mechanical indexes. For patients with soft and thin corneas, under the comprehensive consideration of all aspects of the patient's conditions, it is more appropriate to choose the surgical method with less influence on the mechanics (such as small incision lenticule extraction), and adopt the surgical design such as small light area to ensure the safety and stability of the operation. It can effectively avoid or reduce the occurrence of postoperative complications.

Key words: corneal refractive surgery, corneal biomechanics