Research on the Influencing Factors of Air-puff Test after SMILE Based on Finite Element Analysis

Abstract

The three-dimensional finite element model of the postoperative whole human eye after small incision lenticule extraction (SMILE) surgery and the axisymmetric air-puff model were established, the influencing factors in the Air-puff test were explored from the displacement nephogram on anterior corneal surface. Our results showed that the maximum depression displacement was positively correlated with the corrected diopter when the peak pressure of ejection and air-puff center location were constant, but the highest concavity radius of concave curvature was negatively correlated with the corrected diopter. At the same time, we also found that when the decentration of air-puff center position was 1mm, the maximum depression displacement of the anterior corneal surface was reduced by 8.3% under the condition of constant correction diopter and peak air-puff pressure, compared with the maximum depression displacement of the anterior corneal surface when the decentration of air-puff center position was 0 mm. In conclusion, the corrected diopter and decentration of air-puff position have an important effect on the results of air-puff test after SMILE.