Chinese Journal of Lasers, Volume. 49, Issue 20, 2007101(2022)

Numerical Simulation of Heat Transfer in Fundus Laser Surgery

Penghui Zhao1, Yibo Zhao1, Dong Li1、*, Bin Chen1, and Liang Yao2、**
Author Affiliations
  • 1State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China
  • 2Department of Ophthalmology, the Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, Shaanxi, China
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    Figures & Tables(10)
    Section of simplified three-dimensional model of eyeball
    Schematic of model boundary conditions
    Schematic of whole eye mesh
    Comparison of temperature distribution between our model and reference[13] at ambient temperature of 25 ℃
    Changes of eyeball temperature with pupillary axis at four different ambient temperatures
    Changes of eyeball temperature with pupillary axis at the end of laser treatment at typical wavelengths (ambient temperature Ta=35 ℃). (a) λ=532 nm ; (b) λ=810 nm
    Temperature distribution of whole eye after laser irradiation under whole retina photocoagulation (t=0.1 s). (a) Considering choroidal blood perfusion effect; (b) ignoring choroidal blood perfusion effect
    Distribution of whole eye temperature after laser irradiation under transpupillary thermotherapy (t=60 s).(a) Considering choroidal blood perfusion effect; (b) ignoring choroidal blood perfusion effect
    • Table 1. Geometric and physical parameters of each region of three-dimensional eyeball model[1518-19]

      View table

      Table 1. Geometric and physical parameters of each region of three-dimensional eyeball model[1518-19]

      TissueSpecific heat cp /(J·kg-1·K-1)Density ρ /(kg·m-3)Thermal conductivity k /(W·m-1·K-1)Anisotropy index gThickness H /mm
      Cornea417810500.5800.90. 45
      Aqueous humor39979960.5780.92.8
      Iris334011000.4980.980.35
      Lens399710500.40.94.25
      Vitreous399710000.5940.915.34
      Retina41789920.5650.970.21
      Choroid417811000.530.93250.25
      Sclera417811000.5800.90.7
    • Table 2. Optical parameters of each tissue at different laser wavelengths[1320]

      View table

      Table 2. Optical parameters of each tissue at different laser wavelengths[1320]

      TissueAbsorption coefficient μa/m-1Scattering coefficient μs/m-1
      532 nm810 nm532 nm810 nm
      Cornea61.333.2222681050
      Aqueous humor13.410.410266.38
      Iris3.283.29113.83105.22
      Lens1.783.15.015.3
      Retina2900767.12611318792.2
      Choroid143857605245031945
      Sclera310.219.86798029270
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    Penghui Zhao, Yibo Zhao, Dong Li, Bin Chen, Liang Yao. Numerical Simulation of Heat Transfer in Fundus Laser Surgery[J]. Chinese Journal of Lasers, 2022, 49(20): 2007101

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    Paper Information

    Category: Optical Diagnostics and Therapy

    Received: Mar. 25, 2022

    Accepted: Apr. 19, 2022

    Published Online: Aug. 23, 2022

    The Author Email: Li Dong (lidong@mail.xjtu.edu.cn), Yao Liang (lyao0815@163.com)

    DOI:10.3788/CJL202249.2007101

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