In order to meet people’s higher pursuit of quality of life, we are now introducing Nuctech VISX laser system, which is the world’s number one brand in the field of excimer laser. Its latest generation VISX Star S4 has all the latest technology in the field of excimer laser refractive correction, providing the surgeons with safer surgery and clearer vision, so that you can easily say goodbye to glasses. The excimer laser is a new type of cold laser that is excited by compressed hydrogen fluoride gas (ARF), releasing a high-energy beam with a wavelength of 193 nm. This beam can split several layers of corneal molecular bonds and vaporize cellular tissue without producing a thermal effect on the tissue next to the irradiated area. By relying on this precise ablation, laser cutting does not penetrate the cornea and is much safer. Excimer laser refractive surgery is the leading procedure in the treatment of refractive errors today. With its high degree of predictability, safety, stability, and rapid vision restoration, it is highly sought after by the refractive error community and respected by refractive experts and scholars. As long as one meets the requirements of the procedure and can pass a rigorous preoperative examination, there will be no after-effects.