Finite Element Simulation Of Strabismus And Extraocular Muscle Movement Model

Strabismus is a kind of eye disease with a high incidence,the eyes of patients with strabismus can not stare at the target at the same time,in addition to affecting the facial appearance but also seriously affect the visual function of patients,causing a lot of inconvenience to the life of patients,in addition due to the psychological problems caused by strabismus is also gradually attracting people’s attention.Therefore,it is important for patients to diagnose strabismus as early as possible and undergo corrective surgery.At present,clinical strabismus examination includes inspection,medical history inquiry,visual acuity examination,occlusion examination,oblique viewing Angle examination and eye movement function examination,etc.Most of these methods are complex in operation,require high cooperation of patients,and the examination results depend on doctors’ operation,while the formulation of corrective surgery for strabismus is also highly dependent on doctors’ experience,with certain subjectivity,and the success rate of surgery needs to be improved.Based on this,this paper explores two aspects: the method of strabismus examination based on pupil tracking data and the finite element analysis assisted formulation of surgical correction amount.This subject has a detailed understanding of the relevant knowledge of eyeballs and extraocular muscles at home and abroad and the research progress of strabismus examination methods and corrective surgery,and has consulted relevant basic theories to prepare for the follow-up work.The pupil coordinate data under nine-point visual mark was collected by the strabismus measuring device designed and made by the research group in the early stage,and the data was analyzed and compared.Then the finite element analysis model was established,and the model was used for finite element simulation experiment and analysis to obtain the strabismus correction amount of the model in this paper.Based on the clinical correction data in the literature,normalization was performed to simulate corrective surgery for strabismus.Aiming at the pupil coordinate data of three subjects A,B and C collected,this paper analyzed the data from two aspects of the pupil center motion track and pupil center dispersion diagram,and compared the normal eyes and strabismus eyes to find out the differences.A strabismus inspection method based on the pupil tracking data was proposed to obtain the strabismus direction and size of the strabismus eyes.Combined with the strabismus measuring device,the patients’ strabismus can be completely obtained.Finally,according to the physiological structure and anatomical parameters of the eyeball and extraocular muscle,the paper established the three-dimensional geometric model and the finite element simulation model of the eyeball and extraocular muscle according to the comprehensive consideration of the strabismus operation method and the finite element simulation,and the rationality of the model was verified.In the finite element simulation experiment and analysis,the accuracy of the mesh was controlled,the changes of the relevant extraocular muscle under different directions of eye rotation were simulated,and the relationship between the unit Angle of eye rotation and the variation of the extraocular muscle length was obtained,thus the amount of strabismus correction of the model was obtained.Based on the clinical correction data in the literature,the normalization processing was carried out.Subject C’s strabismus was modeled and the correction amount of strabismus operation was obtained.Subject C’s strabismus was corrected by the simulated strabismus operation.The results showed that the degree of strabismus of subject C changed from 5.474° to 0.51° after correction,indicating that the correction was successful.It is proved that the finite element simulation assisted correction of strabismus has certain clinical reference value.The whole work provides experimental basis and data support for designing an instrument for strabismus examination and operation plan formulation.