To properly view the sense of glare in vision after refractive surgery, it is necessary to first clarify the concept of glare. Glare is a visual condition that causes visual discomfort and reduces the visibility of objects due to unsuitable luminance distribution or extreme luminance contrast in space or time in the visual field. The visual field produces a sensation of light that the human eye cannot adapt to, which may cause disgust, discomfort or even loss of brightness. Excessive brightness in a localized area of the visual field or excessive brightness changes in the front and back. Clinically, patients often complain of reduced vision at night, scattered light in the periphery of the visual field, and the appearance of halos. For glare, it is usually related to the mismatch between the new optical zone formed by the refractive surgery and the pupil diameter, which often leads to glare when the pupil is close to or larger than the optical zone (between 4.65 – 5.5 mm in diameter for ICL crystals and 5 mm for PRL crystals). Therefore, strictly speaking, almost all refractive surgeries may lead to glare, ICL and PRL may, PRK, LASIK and femtosecond will face the same, so a strict grasp of the indications before surgery and exclusion of patients with large pupils will help to reduce its incidence. In fact, there is no need to worry too much about glare after surgery, as most patients can adapt well over time, and some of the more serious patients can be relieved by using pupil reduction agents at night.