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. 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. 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.

中文翻译：

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激光眼科手术中消融效应后激光与角膜相互作用的改进模型

激光角膜重塑是许多屈光障碍的成功治疗方法。然而，激光与角膜相互作用的一些物理演示尚未得到充分解释。在本文中，我们提出了一种改进的模型来精确研究消融阈值、消融速率以及该作用的物理/化学机制。该模型讨论了入射光子与角膜各种成分之间可能发生的光化学反应。这种光化学反应可以通过光烧蚀或仅分子电子激发来结束。消融阈值也是由其他化学反应产生的。最后，另一种化学反应产生了场外碎片。此外，还研究了应用不同激光波长（即常见准分子激光（193 nm）和固态激光（213 nm 和 266 nm））的效果。尽管氟化氩“ArF”激光器取得了成功并无处不在，但我们的结果表明，精心设计的 213 nm 激光器可产生相同的结果，并且可能降低与热量产生和扩散相关的操作缺陷。