3D FEM temperature distribution analysis of the human eye exposed to laser radiation

Cavka,; Poljak, Dragan; Peratta, A.

doi:10.2495/ht100261

Cited by 4 publications

(2 citation statements)

References 17 publications

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“…Steady rise of the temperature along the eye pupillary axis can be seen on Figure 6 for three different values of ambient temperature. Also, the same figure shows temperature distribution from the anterior to the posterior parts of the eye using two-dimensional model from previous work [34]. The lower values in the anterior part of the eye (cornea, aqueous humour) for the two-dimensional model can be clearly seen.…”

Section: The Steady State Resultsmentioning

confidence: 55%

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Fetd Computation of the Temperature Distribution Induced Into a Human Eye by a Pulsed Laser

Cvetković¹,

Poljak²,

Peratta³

2011

PIER

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Abstract-In this paper we present the three-dimensional finite element time domain model of the human eye exposed to pulsed holmium: YAG laser radiation used in thermokeratoplasty procedure. The model is based on the Pennes' bioheat transfer equation and takes into account the focusing action of the lens. The absorption of laser energy inside the eye tissues is modeled using the Lambert-Beer's law. Model takes into account the pulse temporal profile. The maximum temperature values obtained from steady state and transient analysis are compared against those reported from other papers. Finally, sensitivity analysis of several parameters on the calculated temperature field is carried out.

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Section: The Steady State Resultsmentioning

confidence: 55%

“…The analysis of the parameters showed that the diameter of the pupillary opening has a significant effect on the obtained temperature, as reported in [10,34,41]. In the normal human eye, the pupil diameter varies from 1.5 mm to about 8 mm, and is related to the ambient light conditions.…”

Section: Transient Analysis Of Pulsed Ho:yag Lasermentioning

confidence: 57%

Fetd Computation of the Temperature Distribution Induced Into a Human Eye by a Pulsed Laser

Cvetković¹,

Poljak²,

Peratta³

2011

PIER

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The electromagnetic-thermal dosimetry for the homogeneous human brain model

Cvetković

Poljak

Hirata

2016

Engineering Analysis with Boundary Elements

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Human cornea thermo-viscoelastic behavior modelling using standard linear solid model

2023

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Background Corneal biomechanics is of great interest to researchers recently. Clinical findings relate them to corneal diseases and to outcomes of refractive surgery. To have a solid understanding of corneal diseases’ progression, it is important to understand corneal biomechanics. Also, they are essential for better explaining outcomes of refractive surgeries and their undesired consequences. There is a difficulty for studying corneal biomechanics in-vivo and multiple limitations arise for ex-vivo studies. Hence mathematical modelling is considered as a proper solution to overcome such obstacles. Mathematical modelling of cornea in-vivo allows studying corneal viscoelasticity with taking into consideration all boundary conditions existing in real in-vivo situation. Methods Three mathematical models are used to simulate corneal viscoelasticity and thermal behavior in two different loading situations: constant and transient loading. Two models of the three are used for viscoelasticity simulation which are Kelvin-Voigt and standard linear solid models. Also, temperature rise due to the ultrasound pressure push is calculated using bioheat transfer model for both the axial direction and as a 2D spatial map using the third model (standard linear solid model). Results Viscoelasticity simulation results show that standard linear solid model is efficient for describing the viscoelastic behavior of human cornea in both loading conditions. Results show also that the deformation amplitude obtained from standard linear solid model is more reasonable for corneal soft-tissue deformation with respect to corresponding clinical findings than that obtained from Kelvin-Voigt model. Thermal behavior results estimated corneal temperature rise to be roughly 0.2 °C, which conforms with FDA regulations for soft tissue safety. Conclusion Standard Linear Solid (SLS) model is better describing the human corneal behavior in response to constant and transient load more efficiently. Temperature rise (TR) for the corneal tissue of about 0.2 °C is conforming with FDA regulations and even less than the FDA regulations for soft tissue safety.

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3D FEM temperature distribution analysis of the human eye exposed to laser radiation

Cited by 4 publications

References 17 publications

Fetd Computation of the Temperature Distribution Induced Into a Human Eye by a Pulsed Laser

Fetd Computation of the Temperature Distribution Induced Into a Human Eye by a Pulsed Laser

The electromagnetic-thermal dosimetry for the homogeneous human brain model

Human cornea thermo-viscoelastic behavior modelling using standard linear solid model

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