Doctors often tell patients with diabetic retinopathy: Your eyes need laser. Because the vascular disease of the fundus caused by diabetes has reached a more serious level. To use an analogy, the retinal vessels are like water pipes, the pipes of normal people do not leak, while the pipes of diabetic patients are prone to leakage, the role of laser is to close the leaking places and stabilize the blood vessels in the fundus, so as not to let these pipes leak and bleed. Diabetic fundus laser should be done in stages, usually 2-4 times to complete, each time a week apart. After the completion of laser for diabetic retinopathy, it is still necessary to review regularly, usually once in 2 months until the condition is stable, sometimes feel pain during the laser, the doctor can adjust the laser parameters or oral analgesic drugs to relieve most patients’ vision is stable or improved after laser, but there are a few patients with blurred vision after laser, this is because fundus laser can cause macular edema, even vitreous clouding, and These conditions usually improve on their own after 2-3 weeks, and if necessary, vitreous cavity injections are needed to control the condition. The consequences of advanced diabetic retinopathy are catastrophic, and even vitrectomy has little effect and limited recovery of vision when diabetic retinopathy reaches the severe proliferative stage. The patient can take the initiative and prevent the progression of the disease to an advanced stage. Laser therapy is also a double-edged weapon, and we need to be flexible and careful in using this powerful weapon to control diabetic retinopathy.