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.
Highlights
With flapless and small incision, small incision lenticule extraction (SMILE) has high safety, effectiveness, predictability and stability in correcting visual acuity
In this paper, based on the 3D solid model and axisymmetric air-puff model of human eye, the finite element analysis software ANSYS was used to explore the biomechanical effects of corrected diopter, air-puff pressure and air-puff eccentricity on the eyes after SMILE
According to the nephogram of the anterior corneal surface displacement results, the corneal morphological parameters after SMILE under different corrected diopter were obtained by using the curved surface fitting method
Summary
With flapless and small incision, SMILE has high safety, effectiveness, predictability and stability in correcting visual acuity. Air-puff method is a non-contact dynamic measurement method, which can avoid secondary damage to eyes and is widely used in clinic[4]. Ocular response analyzer (ORA) and Corneal Visualization Scheimpflug technology (Corvis-ST) are commonly used in clinic, both of which use air-puff method to deform the cornea[5, 6]. Studied a numerical model of non-contact measurement to explore the biomechanical properties of human cornea through fluid-solid coupling, but his model only used cornea and did not take into account the effects of other structures and tissues. In this paper, based on the 3D solid model and axisymmetric air-puff model of human eye, the finite element analysis software ANSYS was used to explore the biomechanical effects of corrected diopter, air-puff pressure and air-puff eccentricity on the eyes after SMILE
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