Influencing factors of corneal biomechanical effect in air-puff test: a finite-element study(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2020年第12期
- Page:
- 1583-1588
- Research Field:
- 其他（激光医学等）
- Publishing date:
Info
- Title:
- Influencing factors of corneal biomechanical effect in air-puff test: a finite-element study
- Author(s):
- FANG Zhaohui; FANG Lihua; MA Weiwei
- National Engineering Laboratory for Nondestructive Testing and Optoelectric Sensing Technology and Application, Nanchang Hangkong University, Nanchang 330063, China
- Keywords:
- Keywords: air-puff test cornea biomechanics effect finite element analysis
- PACS:
- R318.01
- DOI:
- DOI:10.3969/j.issn.1005-202X.2020.12.021
- Abstract:
- Abstract: Objective To study the effects of intraocular pressure, air-jet pressure and scleral material on corneal biomechanical effect in Air-puff Test. Method Based on the whole-eye three-dimensional model and the axisymmetric jet model, the finite element analysis was performed. According to the displacement nephogram on anterior corneal surface and combined with surface fitting and other methods, the changes of corneal morphological parameters were analyzed. In addition, the effects of intraocular pressure, air jet pressure and scleral material on corneal biomechanical effect were quantitatively analyzed. Results When the peak pressure of ejection and scleral stiffness kept constant, intraocular pressures increase from 12 mmHg to 24 mmHg made the maximum apical displacement of the cornea reduced by 13%, and the value of the curvature radius of the anterior corneal surface increased by 7.3%. When the intraocular pressure and the scleral stiffness remained constant, the peak pressure of ejections increase from 20 kPa to 60 kPa made the maximum apical displacement of the cornea increased by 2.1 times, and the curvature radius of the anterior surface reduced by 0.68 times. When the intraocular pressure and gas ejection pressure peak remained constant, the scleral stiffnesss increase from 1/3 times to 3 times of the baseline made the maximum apical displacement of the cornea reduced by 26.8%. Conclusion Corneal deformation was a reflection of the biomechanical properties of the cornea. It was determined by the combination of IOP, corneal and scleral materials, and external forces. When any of these parameters changed, the biomechanics effect of the cornea was altered.
Keywords: air-puff test cornea biomechanics effect finite element analysis
Last Update: 2020-12-30