The study aimed to develop a novel methodology for numerical simulation of MyoRing surgery by adopting exact surgery procedure into finite element consideration. This study considered both the patient specific geometry and in vivo material model to assess the effect of the MyoRing on surgery outcome. In this project, a straightforward approach was addressed to analyze the effect of MyoRing in keratoconus corneas using 3D finite elements method based on anterior segment optical coherence tomography (AS-OCT) and Pentacam data. The assessment of corneal biomechanics is essential for studying ophthalmological operations, such as refractive surgeries, and for more accurate prediction of refractive outcome. The aim of current study is to characterize keratoconus tissue in order to construct a patient-specific model to simulate the implantation of MyoRing for patients with keratoconus. The chief goal is to identify preoperative factors that influence the postoperative performance of MyoRing for the management of keratoconus. In a retrospective study, medical records of keratoconus patients, who underwent MyoRing implantation using the PocketMakermicrokeratomer, were analyzed by using finite element model before implantation and for a visual outcome after surgery. 3D geometry of the cornea of each patient was obtained from its specific topography. The patient-specific model is obtained from the so called “raw data”, which are generated by systems based on the projection of a slit of light onto the cornea and on the principle of the Scheimpflug photography. To simulate the intervention, the intracorneal ring segments were modeled and placed at the same location where they were placed in the surgery. In the proposed model, the effect of MyoRing on refractive corrections after surgery was studied. The goal of this study is to investigate the relative contribution of surgery on the keratometry data of keratoconus cornea predicted by a hyperelastic finite element model. Keywords : Keratoconus, Finite Element Method, Keratometry, MyoRing, Biomechanics.
