I. Technical performance and advantages of Eagle Vision Blues Cool Eye Excimer Laser tip: 1. Corneal cutting is more precise, uniform and smooth. 2, Wavefront aberration optimization and Q-value adjustment technology make the cutting surface closer to the physiological curvature, greatly improving the patient’s postoperative night vision and visual quality, and providing a new method for the treatment of presbyopia. 3.The individualized surgery guided by corneal topography maximizes the best corrected visual acuity of patients with corneal irregularity, after off-center cutting, large astigmatism, and corneal scarring. 4.Fast treatment speed. The accuracy and predictability of the treatment are ensured to the maximum extent, and the postoperative recovery is fast. Second, WaveLight Eagle Vision FS200 femtosecond laser has the characteristics of fast, accurate and excellent OBL management. In addition to personalized corneal flap fabrication, it can also perform corneal transplantation and corneal stromal ring tunnel fabrication. It is the fastest and most accurate femtosecond laser among all femtosecond lasers in the current market. In addition, the Eagle Vision FS200 has significantly improved the OBL phenomenon that occurred during the previous femtosecond laser surgery and the lack of personalized flap making, making the application of femtosecond laser safer, more efficient and more widely used. It adopts the world’s most advanced Tscherning measurement technology, which is more in line with the physiological optical characteristics of the human eye and has the following advantages: high measurement accuracy; the use of infrared guidance tracking technology consistent with the Eagle Vision excimer laser to ensure the uniformity of the collected data and cutting data; the standard measurement of all information about the low-order and high-order aberrations of the human eye to achieve individualized corneal cutting program In addition, it can return a clear and colorful world to human beings. Fourth, Eagle Vision’s corneal topography can be combined with Eagle Vision’s Bluetone Cool Eye Excimer Laser to complete personalized cutting techniques guided by corneal topography, bringing new hope to patients with previous refractive surgery history (such as radial keratotomy or off-center excimer laser cutting) or irregular corneal astigmatism. V. PENTACAM: The biggest risk of myopic laser surgery is that the original traditional corneal topography and other equipment cannot screen out preclinical cone corneas, which leads to the occurrence of postoperative cone corneas. OCULUS, a German company, has developed a 3D anterior segment measurement and analysis system that combines corneal thickness measurement, anterior and posterior corneal surface topography, cataract analysis and 3D anterior chamber analysis, which is regarded by ophthalmologists as the “gold standard of anterior segment tomography”. It can more accurately screen for early, occult cone corneas, and sensitively and effectively screen for “subclinical cone corneas”. Corvis-ST corneal biomechanical measurement: is a new type of corneal biomechanical measurement device, using ultra-high Scheimpflug camera technology, its measurement parameters include central corneal thickness, intraocular pressure, deformation amplitude, corneal deformation speed, etc., with good repeatability, or can be used for corneal refractive surgery patient screening, preexisting cone corneal progression, and to maximize the maintenance of postoperative corneal biomechanical structural integrity of the postoperative cornea.