| Autor: |
Abdelhalim, Ibrahim, Hamdy, Omnia, Hassan, Aziza Ahmed, Abdelkawi, Salwa, Elnaby, Salah Hassab |
| Předmět: |
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| Zdroj: |
Beni-Suef University Journal of Basic & Applied Sciences; 11/6/2023, Vol. 12 Issue 1, p1-14, 14p |
| Abstrakt: |
Background: Laser corneal reshaping is a successful treatment of many refraction disorders. However, some physical demonstrations for the laser interaction with cornea are not fully explained. In the current paper, we present a modified model to precisely investigate the ablation threshold, the ablation rate and the physical/chemical mechanisms in that action. Results: The model discusses the possible photochemical reaction between the incident photons and various components of the cornea. Such photochemical reaction may end by photo-ablation or just molecular electronic excitation. The ablation threshold is also produced by other chemical reaction. Finally another chemical reaction creates out-site fragments. Moreover, the effect of applying different laser wavelengths, namely the common excimer-laser (193-nm), and the solid-state lasers (213-nm & 266-nm) has been investigated. Conclusion: Despite the success and ubiquity of the Argon Fluoride "ArF" laser, our results reveal that a carefully designed 213-nm laser gives the same outcomes with the potential of possible lower operational drawbacks related with heat generation and diffusion. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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