Assessing the local temperature of human cornea exposed to surface ablation by different laser refractive-surgery devices: a numerical comparative study

Ibrahim Abdelhalim; Omnia Hamdy; Aziza Ahmed Hassan; Salah Hassab Elnaby

doi:10.1007/s10103-021-03347-5

Assessing the local temperature of human cornea exposed to surface ablation by different laser refractive-surgery devices: a numerical comparative study

Lasers Med Sci. 2021 Oct;36(8):1725-1731. doi: 10.1007/s10103-021-03347-5. Epub 2021 Jun 11.

Authors

Ibrahim Abdelhalim¹, Omnia Hamdy², Aziza Ahmed Hassan³, Salah Hassab Elnaby¹

Affiliations

¹ Engineering Applications of Laser Department, National Institute of Laser Enhanced Sciences, Cairo University, Giza, 12613, Egypt.
² Engineering Applications of Laser Department, National Institute of Laser Enhanced Sciences, Cairo University, Giza, 12613, Egypt. omnia@niles.edu.eg.
³ Medical Applications of Laser Department, National Institute of Laser Enhanced Sciences, Cairo University, Giza, 12613, Egypt.

PMID: 34117538
DOI: 10.1007/s10103-021-03347-5

Abstract

To evaluate the local temperature at corneal tissue after applying single laser pulse from six commercial devices; Medilex™, Katana laser-soft, MEL90, Technolas-Teneo317, Alcon EX500, and Pulzar^TMZ1. The temperature distribution is simulated using finite element solution of the Penne's bio-heat transfer equation on a 3-D model of human cornea using the manufacturer's assigning parameters. The obtained results showed that the heating effect of Katana laser soft is 40% lower than MEL90 and Pulzar™ Z1, while the broad beam Medilex™ showed the minimum temperature rise especially at 248-nm laser radiation. The change in laser parameters selected for ablation has significant effect on the corneal local temperature. The broad beam-based device produces lower local corneal temperature than other flying spot types.

Keywords: Cornea; LASIK; Penne’s bio-heat transfer equation; UV laser.

MeSH terms

Cornea / surgery
Humans
Keratomileusis, Laser In Situ*
Lasers, Excimer / therapeutic use
Myopia* / surgery
Temperature