THERMAL SCIENCE

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Mayada M. Tahir

THRESHOLD OF PERMANENT CORNEA THERMAL DAMAGE DUE TO INCIDENTAL CONTINUOUS WAVE CO2 LASER IRRADIATION

ABSTRACT
Cornea thermal damage due to incidental continuous wave CO2 laser irradiation is studied numerically based on bio-heat equation. The interaction of laser with tissue leads to a rapid temperature increased in target and the nearby tissue. As the temperature of the eye surface reaches 44°C, a sensation of pain will cause aversion response of the reflex blink and/or shifting away from the source of pain. The aim of the work is to predict numerically the threshold limit of incidental laser power that causes damage to the anterior part of the cornea, which can be healed within 2-5 days as long as damage is not exceeding the outer part of the eye (epithelium). A finite element analysis is used to predict temperature distribution through the cornea where the necroses region can be obtained using thermal dose equation. The thermal dose that required for damaging the cornea is predicted from previously published experimental data on rhesus monkeys and used later as a limit for shrinkage to human cornea. The result of this work is compared by international standard of safety and a good nearby result is obtained which verified the result of this work.
KEYWORDS
cornea thermal damage, laser safety, incidental laser accident, continuous wave CO2 laser, finite element analysis
PAPER SUBMITTED: 2009-12-03
PAPER REVISED: 2010-01-04
PAPER ACCEPTED: 2010-01-06
DOI REFERENCE: https://doi.org/10.2298/TSCI1002459T
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2010, VOLUME 14, ISSUE Issue 2, PAGES [459 - 467]
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Threshold of permanent cornea thermal damage due to incidental continuous wave CO2 laser irradiation

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence