Analysis of the effects of corneal viscoelasticity on air-puff test
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    Abstract:

    Objective:To explore the role of corneal viscoelasticity on air-puff test under different conditions. Methods: Based on the patient's corneal topographic data, a patient-specific model of the whole human eye was constructed, and the air-puff model was loaded. The differences of air-puff test results of linear elastic and viscoelastic corneal materials under different conditions were analyzed. Results: When the corneal stiffness, intraocular pressure and scleral stiffness were all the same, the maximum corneal apical displacement of linear elastic corneal material was 0.01~0.03mm smaller than that of viscoelasticity. With the intraocular pressure increasing from 12 mmHg to 24 mmHg, the decreasing rate of the corneal apical maximum displacement when loaded with linear elastic corneal material was only 0.9 μm / mmHg slower than that when loaded with viscoelastic material. With the corneal stiffness increased from 0.827 MPa to 2.790 MPa, the decreasing rate of the corneal apical maximum displacement when loaded with linear elastic corneal material was only 8 μm/MPa slower than that when loaded with viscoelastic material. With the scleral stiffness increased from 1.24 MPa to 9.92 MPa, the decreasing rate of the corneal apical maximum displacement when loaded with linear elastic corneal material was only 1.1 μm/MPa slower than that when loaded with viscoelastic material. Conclusions: The corneal apical displacement in the air-puff test was mainly driven by the elasticity of the corneal tissue, but the role of corneal viscoelasticity in the air-puff test was not obvious. Therefore, the effect of corneal viscoelasticity can be ignored when air-puff method was used to evaluate corneal biomechanical response.

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History
  • Received:April 23,2022
  • Revised:June 21,2022
  • Adopted:June 21,2022
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